Bugs with watcher scope implementation

[[Diseased Vermin]] uses a custom watcher with scope GAME to track status specific to a permanent.

Direct usage of `sourceId` field looks bad, only makes sense for a CARD scope watcher.

But... CARD scope watcher logic I think is fundamentally bugged for this usage anyway, because it doesn't check zcc.

Maybe should consider refactoring every watcher to GAME scope and no longer using PLAYER/CARD scope watchers at all.