Fix onInputChange being called twice

ULS input element had onInputChange() handler attached to
change, textInput and input events.

That caused onInputChange() to be called twice when there is user
input and ULS gets closed, since 'change' event fires when
<input type="text"> element loses focus.

Registering handler only for 'input' is sufficient for the intent.

src/jquery.uls.languagefilter.js

@@ -59,10 +59,7 @@
 
 		listen: function () {
 			this.$element.on( 'keydown', this.keypress.bind( this ) );
-			this.$element.on(
-				'change textInput input',
-				$.fn.uls.debounce( this.onInputChange.bind( this ), 300 )
-			);
+			this.$element.on( 'input', $.fn.uls.debounce( this.onInputChange.bind( this ), 300 ) );
 
 			if ( this.$clear.length ) {
 				this.$clear.on( 'click', this.clear.bind( this ) );