Revert "Improvements to presence stanza detection"
Revert "Improvements to presence stanza detection"

This reverts commit 48377b75b37653d6071e389683aa24698877ef51.

PeterDaveHello/cryptocat,Cryptodog/cryptocat,wakermahmud/cryptocat,DGO143/cryptocat,arno01/cryptocat,Cryptodog/cryptocat,arno01/cryptocat,PeterDaveHello/cryptocat,DoNotUseThisCodeJUSTFORKS/cryptocat,Raynes/cryptocat,wakermahmud/cryptocat,Raynes/cryptocat,DGO143/cryptocat,DoNotUseThisCodeJUSTFORKS/cryptocat,DoNotUseThisCodeJUSTFORKS/cryptocat,DGO143/cryptocat,Raynes/cryptocat