default password warning: fix close button, don't crash if dialog is recreated (on feed tree reload etc)

classes/dlg.php

@@ -199,7 +199,7 @@ class Dlg extends Handler_Protected {
 		print "<button dojoType='dijit.form.Button' onclick=\"document.location.href = 'prefs.php'\">".
 			__('Open Preferences')."</button> ";
 		print "<button dojoType='dijit.form.Button'
-			onclick=\"return CommonDialogs.closeInfoBox()\">".
+			onclick=\"return dijit.byId('defaultPasswordDlg').hide();\">".
 			__('Close this window')."</button>";
 		print "</footeer>";
 	}

js/Feeds.js

@@ -221,6 +221,9 @@ define(["dojo/_base/declare"], function (declare) {
 			if (App.getInitParam("is_default_pw")) {
 				console.warn("user password is at default value");
 
+				if (dijit.byId("defaultPasswordDlg"))
+					dijit.byId("defaultPasswordDlg").destroyRecursive();
+
 				const dialog = new dijit.Dialog({
 					title: __("Your password is at default value"),
 					href: "backend.php?op=dlg&method=defaultpasswordwarning",