Clear the search once a search and selection is done

See https://bugzilla.wikimedia.org/show_bug.cgi?id=48151

Change-Id: I7b354835c7ff438bb665ca6f9b62da6ff5059e1c

src/jquery.uls.core.js

@@ -295,7 +295,7 @@
 		 */
 		select: function ( langCode ) {
 			this.hide();
-
+			this.$languageFilter.trigger( 'searchclear' );
 			if ( this.options.onSelect ) {
 				this.options.onSelect.call( this, langCode );
 			}