otr: fix whitespace tag parsing
otr: fix whitespace tag parsing

fixes #2257

ChatSecure/ChatSecureAndroid,31H0B1eV/ChatSecureAndroid,31H0B1eV/ChatSecureAndroid,31H0B1eV/ChatSecureAndroid,OnlyInAmerica/ChatSecureAndroid,n8fr8/ChatSecureAndroid,ChatSecure/ChatSecureAndroid,joskarthic/chatsecure,guardianproject/ChatSecureAndroid,10045125/ChatSecureAndroid,Heart2009/ChatSecureAndroid,eighthave/ChatSecureAndroid,OnlyInAmerica/ChatSecureAndroid,joskarthic/chatsecure,10045125/ChatSecureAndroid,prembasumatary/ChatSecureAndroid,eighthave/ChatSecureAndroid,n8fr8/AwesomeApp,h2ri/ChatSecureAndroid,ChatSecure/ChatSecureAndroid,n8fr8/AwesomeApp,kden/ChatSecureAndroid,n8fr8/ChatSecureAndroid,n8fr8/ChatSecureAndroid,ChatSecure/ChatSecureAndroid,n8fr8/AwesomeApp,maheshwarishivam/ChatSecureAndroid,h2ri/ChatSecureAndroid,OnlyInAmerica/ChatSecureAndroid,anvayarai/my-ChatSecure,guardianproject/ChatSecureAndroid,guardianproject/ChatSecureAndroid,kden/ChatSecureAndroid,OnlyInAmerica/ChatSecureAndroid,h2ri/ChatSecureAndroid,prembasumatary/ChatSecureAndroid,bonashen/ChatSecureAndroid,bonashen/ChatSecureAndroid,Heart2009/ChatSecureAndroid,eighthave/ChatSecureAndroid,maheshwarishivam/ChatSecureAndroid,maheshwarishivam/ChatSecureAndroid,kden/ChatSecureAndroid,joskarthic/chatsecure,10045125/ChatSecureAndroid,prembasumatary/ChatSecureAndroid,Heart2009/ChatSecureAndroid,anvayarai/my-ChatSecure,anvayarai/my-ChatSecure,bonashen/ChatSecureAndroid