Fixed context menu on apps

app/ux/WebView.js

@@ -230,7 +230,9 @@ Ext.define('Rambox.ux.WebView',{
 
 		var webview = me.down('component').el.dom;
 
-		require('electron-context-menu')({window: webview});
+		setTimeout(function() {
+			require('electron-context-menu')({window: webview});
+		}, 100);
 
 		// Google Analytics Event
 		ga_storage._trackEvent('Services', 'load', me.type, 1, true);