[NITF] added evloc element in NTB NITF
[NITF] added evloc element in NTB NITF

<evloc/> element was missing, this patch add it

SDNTB-229

petrjasek/superdesk-ntb,petrjasek/superdesk-ntb,ioanpocol/superdesk-ntb,superdesk/superdesk-ntb,petrjasek/superdesk-ntb,superdesk/superdesk-ntb,ioanpocol/superdesk-ntb,superdesk/superdesk-ntb,petrjasek/superdesk-ntb,ioanpocol/superdesk-ntb,superdesk/superdesk-ntb