luci-app-vnstat: Fix blank graphs for iface names with underscores
luci-app-vnstat: Fix blank graphs for iface names with underscores

The regex used to process the iface query string argument in
vnstat.htm was stripping underscores, which caused the graph not to
display for interfaces with names containing underscores.  This
patch adds the underscore to that regex so that the interface name
will be correct and the graph will be displayed.

Signed-off-by: Michael Marley <17b9e1c64588c7fa6419b4d29dc1f4426279ba01@michaelmarley.com>

Hostle/luci,obsy/luci,remakeelectric/luci,male-puppies/luci,shangjiyu/luci-with-extra,mumuqz/luci,ollie27/openwrt_luci,zhaoxx063/luci,kuoruan/luci,tcatm/luci,MinFu/luci,cappiewu/luci,oneru/luci,cshore-firmware/openwrt-luci,forward619/luci,lbthomsen/openwrt-luci,marcel-sch/luci,schidler/ionic-luci,chris5560/openwrt-luci,teslamint/luci,urueedi/luci,MinFu/luci,teslamint/luci,mumuqz/luci,male-puppies/luci,openwrt/luci,wongsyrone/luci-1,Noltari/luci,oyido/luci,Wedmer/luci,taiha/luci,joaofvieira/luci,mumuqz/luci,shangjiyu/luci-with-extra,schidler/ionic-luci,MinFu/luci,male-puppies/luci,oyido/luci,deepak78/new-luci,ff94315/luci-1,bright-things/ionic-luci,nmav/luci,LuttyYang/luci,wongsyrone/luci-1,Hostle/luci,obsy/luci,shangjiyu/luci-with-extra,sujeet14108/luci,openwrt-es/openwrt-luci,mumuqz/luci,thess/OpenWrt-luci,LazyZhu/openwrt-luci-trunk-mod,forward619/luci,nmav/luci,LuttyYang/luci,artynet/luci,lbthomsen/openwrt-luci,tcatm/luci,chris5560/openwrt-luci,obsy/luci,urueedi/luci,rogerpueyo/luci,aa65535/luci,wongsyrone/luci-1,hnyman/luci,deepak78/new-luci,schidler/ionic-luci,lbthomsen/openwrt-luci,forward619/luci,981213/luci-1,chris5560/openwrt-luci,jorgifumi/luci,jorgifumi/luci,hnyman/luci,dwmw2/luci,thesabbir/luci,obsy/luci,aa65535/luci,rogerpueyo/luci,LuttyYang/luci,cshore/luci,maxrio/luci981213,thess/OpenWrt-luci,Wedmer/luci,jorgifumi/luci,LuttyYang/luci,maxrio/luci981213,MinFu/luci,NeoRaider/luci,981213/luci-1,mumuqz/luci,NeoRaider/luci,lbthomsen/openwrt-luci,jlopenwrtluci/luci,taiha/luci,openwrt-es/openwrt-luci,taiha/luci,cshore-firmware/openwrt-luci,kuoruan/luci,artynet/luci,nmav/luci,openwrt-es/openwrt-luci,schidler/ionic-luci,dwmw2/luci,ff94315/luci-1,daofeng2015/luci,bright-things/ionic-luci,artynet/luci,dwmw2/luci,jchuang1977/luci-1,sujeet14108/luci,jlopenwrtluci/luci,zhaoxx063/luci,rogerpueyo/luci,marcel-sch/luci,ollie27/openwrt_luci,sujeet14108/luci,shangjiyu/luci-with-extra,kuoruan/lede-luci,thesabbir/luci,male-puppies/luci,rogerpueyo/luci,openwrt/luci,maxrio/luci981213,dwmw2/luci,deepak78/new-luci,Hostle/luci,wongsyrone/luci-1,marcel-sch/luci,sujeet14108/luci,kuoruan/lede-luci,rogerpueyo/luci,oneru/luci,remakeelectric/luci,fkooman/luci,taiha/luci,jorgifumi/luci,daofeng2015/luci,sujeet14108/luci,teslamint/luci,openwrt-es/openwrt-luci,Hostle/luci,obsy/luci,sujeet14108/luci,tcatm/luci,kuoruan/luci,marcel-sch/luci,wongsyrone/luci-1,jchuang1977/luci-1,jlopenwrtluci/luci,LazyZhu/openwrt-luci-trunk-mod,maxrio/luci981213,shangjiyu/luci-with-extra,remakeelectric/luci,openwrt/luci,teslamint/luci,cshore/luci,kuoruan/lede-luci,obsy/luci,cshore-firmware/openwrt-luci,teslamint/luci,kuoruan/luci,jorgifumi/luci,oneru/luci,kuoruan/luci,male-puppies/luci,ff94315/luci-1,jlopenwrtluci/luci,obsy/luci,LazyZhu/openwrt-luci-trunk-mod,maxrio/luci981213,zhaoxx063/luci,daofeng2015/luci,NeoRaider/luci,shangjiyu/luci-with-extra,Noltari/luci,daofeng2015/luci,jorgifumi/luci,thesabbir/luci,aa65535/luci,kuoruan/luci,bright-things/ionic-luci,NeoRaider/luci,zhaoxx063/luci,fkooman/luci,thess/OpenWrt-luci,zhaoxx063/luci,bittorf/luci,981213/luci-1,nmav/luci,chris5560/openwrt-luci,Noltari/luci,Noltari/luci,nmav/luci,thess/OpenWrt-luci,wongsyrone/luci-1,fkooman/luci,fkooman/luci,fkooman/luci,ollie27/openwrt_luci,daofeng2015/luci,tobiaswaldvogel/luci,openwrt/luci,schidler/ionic-luci,joaofvieira/luci,Wedmer/luci,zhaoxx063/luci,bright-things/ionic-luci,deepak78/new-luci,Wedmer/luci,maxrio/luci981213,thess/OpenWrt-luci,nmav/luci,openwrt/luci,bittorf/luci,hnyman/luci,bittorf/luci,taiha/luci,cappiewu/luci,daofeng2015/luci,mumuqz/luci,tobiaswaldvogel/luci,remakeelectric/luci,jlopenwrtluci/luci,forward619/luci,fkooman/luci,joaofvieira/luci,jchuang1977/luci-1,aa65535/luci,bittorf/luci,lbthomsen/openwrt-luci,kuoruan/lede-luci,tcatm/luci,sujeet14108/luci,thesabbir/luci,male-puppies/luci,male-puppies/luci,NeoRaider/luci,mumuqz/luci,oneru/luci,cshore/luci,mumuqz/luci,oyido/luci,joaofvieira/luci,zhaoxx063/luci,openwrt/luci,981213/luci-1,ollie27/openwrt_luci,aa65535/luci,cappiewu/luci,Hostle/luci,ff94315/luci-1,jchuang1977/luci-1,ff94315/luci-1,remakeelectric/luci,joaofvieira/luci,981213/luci-1,shangjiyu/luci-with-extra,cappiewu/luci,Noltari/luci,hnyman/luci,tobiaswaldvogel/luci,lbthomsen/openwrt-luci,Hostle/luci,Noltari/luci,nmav/luci,thesabbir/luci,maxrio/luci981213,artynet/luci,openwrt-es/openwrt-luci,urueedi/luci,jorgifumi/luci,MinFu/luci,cshore-firmware/openwrt-luci,aa65535/luci,oneru/luci,ff94315/luci-1,male-puppies/luci,cshore-firmware/openwrt-luci,cappiewu/luci,cshore/luci,zhaoxx063/luci,Wedmer/luci,lbthomsen/openwrt-luci,forward619/luci,urueedi/luci,rogerpueyo/luci,tobiaswaldvogel/luci,LuttyYang/luci,ollie27/openwrt_luci,ollie27/openwrt_luci,aa65535/luci,remakeelectric/luci,tcatm/luci,marcel-sch/luci,bright-things/ionic-luci,jorgifumi/luci,daofeng2015/luci,taiha/luci,urueedi/luci,ff94315/luci-1,openwrt-es/openwrt-luci,nmav/luci,oyido/luci,oyido/luci,tobiaswaldvogel/luci,cshore-firmware/openwrt-luci,obsy/luci,artynet/luci,forward619/luci,deepak78/new-luci,schidler/ionic-luci,fkooman/luci,bittorf/luci,remakeelectric/luci,bittorf/luci,teslamint/luci,shangjiyu/luci-with-extra,tobiaswaldvogel/luci,daofeng2015/luci,fkooman/luci,kuoruan/lede-luci,thesabbir/luci,oneru/luci,cshore/luci,artynet/luci,ff94315/luci-1,joaofvieira/luci,nmav/luci,jchuang1977/luci-1,thess/OpenWrt-luci,LazyZhu/openwrt-luci-trunk-mod,MinFu/luci,cshore/luci,oyido/luci,chris5560/openwrt-luci,Noltari/luci,LuttyYang/luci,cshore-firmware/openwrt-luci,bittorf/luci,dwmw2/luci,chris5560/openwrt-luci,teslamint/luci,MinFu/luci,thess/OpenWrt-luci,joaofvieira/luci,taiha/luci,artynet/luci,jchuang1977/luci-1,urueedi/luci,LazyZhu/openwrt-luci-trunk-mod,forward619/luci,openwrt-es/openwrt-luci,cappiewu/luci,hnyman/luci,joaofvieira/luci,cshore/luci,981213/luci-1,oyido/luci,Hostle/luci,tcatm/luci,hnyman/luci,deepak78/new-luci,wongsyrone/luci-1,tcatm/luci,Noltari/luci,ollie27/openwrt_luci,jchuang1977/luci-1,chris5560/openwrt-luci,taiha/luci,schidler/ionic-luci,thesabbir/luci,forward619/luci,bittorf/luci,deepak78/new-luci,openwrt/luci,wongsyrone/luci-1,NeoRaider/luci,cshore/luci,lbthomsen/openwrt-luci,981213/luci-1,NeoRaider/luci,cappiewu/luci,Hostle/luci,rogerpueyo/luci,Wedmer/luci,marcel-sch/luci,oneru/luci,deepak78/new-luci,jchuang1977/luci-1,dwmw2/luci,kuoruan/luci,bright-things/ionic-luci,tobiaswaldvogel/luci,rogerpueyo/luci,urueedi/luci,maxrio/luci981213,Noltari/luci,sujeet14108/luci,teslamint/luci,kuoruan/luci,LuttyYang/luci,openwrt-es/openwrt-luci,jlopenwrtluci/luci,oneru/luci,bright-things/ionic-luci,tcatm/luci,kuoruan/lede-luci,bright-things/ionic-luci,marcel-sch/luci,marcel-sch/luci,ollie27/openwrt_luci,dwmw2/luci,thesabbir/luci,kuoruan/lede-luci,thess/OpenWrt-luci,artynet/luci,cappiewu/luci,Wedmer/luci,hnyman/luci,dwmw2/luci,LuttyYang/luci,schidler/ionic-luci,remakeelectric/luci,LazyZhu/openwrt-luci-trunk-mod,LazyZhu/openwrt-luci-trunk-mod,tobiaswaldvogel/luci,cshore-firmware/openwrt-luci,MinFu/luci,Wedmer/luci,LazyZhu/openwrt-luci-trunk-mod,openwrt/luci,chris5560/openwrt-luci,NeoRaider/luci,oyido/luci,urueedi/luci,artynet/luci,jlopenwrtluci/luci,jlopenwrtluci/luci,hnyman/luci,kuoruan/lede-luci,aa65535/luci