Fix for Vivaldi-snapshot browser logging on Linux
Fix for Vivaldi-snapshot browser logging on Linux

Vivaldi has currently 2 branches, Vivaldi-stable and Vivaldi-snapshot. Added snapshot to the list. There is also Android version, and we might want to test logging on windows as well (eg. we might need vivaldi.exe added). This is potentially part of bigger issue, having the list of all browsers listed in appnames. Solves: https://github.com/ActivityWatch/activitywatch/issues/314#issuecomment-557589185
ActivityWatch/aw-webui,ActivityWatch/aw-webui,ActivityWatch/aw-webui