Force mobile friendly mediawiki ui interfaces where possible.

This makes pages like Special:Blockuser and Special:Preferences
more render nicely on a mobile screen and using mediawiki ui to
be consistent with other mobile pages.

Change-Id: I430c0fbb79d2a33bb828b2427bda0ee01115d73f
Dependency: I47db5eab4569514d039261d11b6dedb0eeae17b5
Bug: 63428
Merge "Force mobile friendly mediawiki ui interfaces where possible."