history.replaceState: Drop unused argument

Per https://developer.mozilla.org/en-US/docs/Web/API/History/replaceState

Change-Id: I6687967c8c8f29393f7f10a3234f42754d192953

resources/js/ext.uls.setlang.js

@@ -74,7 +74,7 @@
 
 	function removeSetLangFromHistory() {
 		if ( 'setlang' in mw.Uri().query ) {
-			history.replaceState( null, 'no-setlang-url', currentUrlWithoutSetLang() );
+			history.replaceState( null, '', currentUrlWithoutSetLang() );
 		}
 	}