LPS-44575 Make sure that setRefererPlid() is always invoked before setLookAndFeel()

Hi Manuel,

we finally changed the code to use only `themeDisplay.getRefererPlid()`

I'm not sure how to change the tests you changed in #316. Is it better to revert the changes or somehow hook into the tests and fix them again? 

The pull to Brian: https://github.com/brianchandotcom/liferay-portal/pull/19103

Thanks.