Remove URL parameter setlang from history when language is unchanged

This change allows to use the ULS language changer without getting a
dialog for restoring the old language.

This change requires that the module is also loaded in this case.

Change-Id: Ie5169e986d0362034ede122b0bc29ce7a4aa481e

includes/UniversalLanguageSelectorHooks.php

@@ -162,11 +162,6 @@ class UniversalLanguageSelectorHooks {
 			return;
 		}
 
-		if ( $out->getLanguage()->getCode() === $languageToSet ) {
-			// If we are already using the preferred language, don't bother.
-			return;
-		}
-
 		$out->addModules( 'ext.uls.setlang' );
 	}