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Vassals do not switch primary culture

Stops AI non-tributary subjects from switching their primary culture.

Is enforcing culture kind of broken especially considering vassals never revolt? Maybe. Is having to re-enforce culture on them constantly until you get a solid majority a good counterbalance? Perhaps. But a very annoying one.

Right now the mod is kind of a cheat. Unless Paradox changes this in upcoming patches I'll try to balance this myself by changing enforce culture into a flag that permanently raises liberty desire and disallows changing culture while it's on.