fix metadata_size in sent message
fix metadata_size in sent message

gillesdemey/webtorrent,dan-hill/webtorrent,nicola/webtorrent,Stiveknx/webtorrent,serafinfernandez/webtorrent,LinusU/webtorrent,ngjermundshaug/webtorrent,dan-hill/webtorrent,yciabaud/webtorrent,karissa/webtorrent,webtorrent/webtorrent,akiva/webtorrent,lucamaraschi/webtorrent,rozifus/webtorrent,LinusU/webtorrent,joshterrill/webtorrent,ericwooley/webtorrent,jamesliu96/webtorrent,fisch0920/webtorrent,loon3/webtorrent,ericwooley/webtorrent,webtorrent/webtorrent,sideffect0/webtorrent,MiracleBlue/webtorrent,Stiveknx/webtorrent,joshterrill/webtorrent,serafinfernandez/webtorrent,loon3/webtorrent,feross/webtorrent,solderzzc/webtorrent,tradle/webtorrent,akiva/webtorrent,feross/webtorrent,lucamaraschi/webtorrent,beni55/webtorrent,FabianFrancoRoldan/webtorrent,karissa/webtorrent,adriagalin/webtorrent,yciabaud/webtorrent,rom1504/webtorrent,gillesdemey/webtorrent,jamesliu96/webtorrent,beni55/webtorrent,MiracleBlue/webtorrent,ngjermundshaug/webtorrent,madmarks/webtorrent,solderzzc/webtorrent,jakefb/webtorrent,whitef0x0/webtorrent,rozifus/webtorrent,madmarks/webtorrent,whitef0x0/webtorrent,jakefb/webtorrent,tradle/webtorrent,fisch0920/webtorrent,adriagalin/webtorrent,FabianFrancoRoldan/webtorrent,nicola/webtorrent,sideffect0/webtorrent,arestov/webtorrent