VE-1165 Modify script to enable VisualEditor on non-WAM wikis

For the exclusion list, I could remove the "if $forceVisualEdior" condition but regardless the first "continue" will cover Lyrics, Marvel, etc.

But I think we would only want to skip WAM if we were disabling. Otherwise, if we skip WAM wikis when enabling, we could end up with VE not enabled on some wikis at the end, because they are in WAM now but weren't a few weeks ago when we were doing only WAM. That's why I separated the logic into two conditionals.