Fix module loading on MediaWiki 1.31 and earlier

368fe37a1a is broken when used on MediaWiki 1.31 and earlier because
it tries to add

  $modules['ext.uls.displaysettings']['dependencies'][]

although $modules['ext.uls.displaysettings'] does not exist.

The whole module definition must moved from extension.json to
UniversalLanguageSelector.hooks.php.

Change-Id: Ie8f7f084c965e6dee33fef03448004d5d8805f2c

UniversalLanguageSelector.hooks.php

@@ -482,6 +482,30 @@ class UniversalLanguageSelectorHooks {
 			'localBasePath' => __DIR__ . '/resources',
 			'remoteExtPath' => 'UniversalLanguageSelector/resources'
 		];
+		$modules['ext.uls.displaysettings'] = [
+			'scripts' => 'js/ext.uls.displaysettings.js',
+			'styles' => 'css/ext.uls.displaysettings.less',
+			'dependencies' => [
+				'ext.uls.languagesettings',
+				'ext.uls.mediawiki',
+				'ext.uls.webfonts',
+				'mediawiki.api',
+				'mediawiki.ui.checkbox',
+				'mediawiki.ui.button',
+				'mediawiki.user'
+			],
+			'localBasePath' => __DIR__ . '/resources',
+			'remoteExtPath' => 'UniversalLanguageSelector/resources'
+		];
+		$modules['ext.uls.preferences'] = [
+			'scripts' => 'js/ext.uls.preferences.js',
+			'dependencies' => [
+				'mediawiki.user',
+				'mediawiki.api'
+			],
+			'localBasePath' => __DIR__ . '/resources',
+			'remoteExtPath' => 'UniversalLanguageSelector/resources'
+		];
 		if ( version_compare( $wgVersion, '1.32', '<' ) ) {
 			// Support: MediaWiki 1.31 and earlier (T200168)
 			$modules['ext.uls.displaysettings']['dependencies'][] = 'mediawiki.api.parse';