Revert "Add a MediaWiki preference for enabling ULS IME"

This reverts commit 6ae0fe3e44.
The commit was duplicating the preferences in 2 places
making the syncing hard.
As per discussion with Pau, we will try alternate approach.

Bug: 48642
Change-Id: I5c97838ed875364dc35b66a3d6c33d9975b5107e

UniversalLanguageSelector.hooks.php

@@ -295,20 +295,10 @@ class UniversalLanguageSelectorHooks {
 	}
 
 	public static function onGetPreferences( $user, &$preferences ) {
-		// The detailed preferences for different layouts.
-		// Saved as JSON and modifiable through the ULS screens.
 		$preferences['uls-preferences'] = array(
 			'type' => 'api',
 		);
 
-		// A checkbox in the general MediaWiki preferences screen
-		// to enable or disable IME in ULS
-		$preferences['uls-ime-enable'] = array(
-			'type' => 'toggle',
-			'label-message' => 'uls-ime-enable-preferences-label',
-			'section' => 'editing/advancedediting', // under 'Advanced options' section of 'Editing' tab
-		);
-
 		return true;
 	}