Remove patrol config check in User::isAllowed()

Remove patrol config check in User::isAllowed()

The isAllowed() function of the User class checks $wgUseRCPatrol and
$wgUseNPPatrol in case the action is 'patrol' or 'autopatrol'.
Considering we have the useRCPatrol and such functions, it shouldn't.
getUserPermissionsErrors of the Title class doesn't and extensions may
use patrol regardless of core config. If we don't remove it, we would
have to also check the new $wgUseFilePatrol.

Change-Id: I671a6b3aa3bd1dc274f2f8e61fb739235ced198c