desktop/windowRules: fix matching on content prop

[ssareta]

Describe your PR, what does it fix/add?

Match checker for content type is RULE_MATCH_ENGINE_INT, but the switch was comparing input prop (int, as mentioned in wiki) to a string which doesn't work, so just use the content type enum directly instead. Fixes #12887.

Is there anything you want to mention? (unchecked code, possible bugs, found problems, breaking compatibility, etc.)

If you write match:content game in your rule or something similar, instead of match:content 3, every window will be matched against. But this behaviour is consistent for all other rules too, not unique for content type, and generally there's no validation/errors thrown for putting strings where ints should be/vice versa.

Probably doesn't matter since it clearly mentions what the allowed rule values are in the wiki, but thought I'd mention it.

Is it ready for merging, or does it need work?

Ready!

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