Idolise Magic reform faith fix

[Kumole]

Updated triggers to allow specific Idolised Magic type when reforming faiths that already have the doctrine.

Fix for this issue: #308

Changelog:

• Fixed an issue where certain faiths couldn't be reformed with already held Idolised doctrines

Developer changelog:

• Added trigger to allow faiths with preexisting idolised magic doctrines to reform with current doctrines.
• Faiths with Idolised magic doctrines can now only change to "Accepted" when reforming,

Tests:

• There are no errors in wc files in Documents\Paradox Interactive\Crusader Kings III\logs\error.log except portrait_decals.cpp:101
• The mod takes less than 5.5 GB in the Task Manager (Windows)

[helloruhe]

LGTM! Thank you!