Fix watchlist scripts dependency

The default dependency of mobile.stable provided by
$wgMFMobileSpecialPageResourceScriptBoilerplate
 is not dependant as this does not add a dependency to
mobile.loggingSchemas

Overriding in this fashion doesn't work. Previous value gets kept

Bug: 55490
Change-Id: I7d102a4eeb6a62da1bd774de51a8464c5424f2eb
Merge "Fix watchlist scripts dependency"