[Expressive] Preference screen using MenuPreferences crashes if Expressive theme isn't enabeld.

The `MenuPreference` attempts to always use the `settingslib_expressive_preference`
even if the expressive is not enabled. Note it's still possible to use
`settingslib_expressive_preference` even if expressive isn't enabled.

Bug: 443709750
Test: visual verify
Flag: EXEMPT bugfix
Change-Id: If890302bcba6a08744a078d462032b4c6d864444