close currently active dialog if a different one is activated

src/public/javascripts/dialogs/help.js

@@ -1,6 +1,10 @@
+import utils from "../services/utils.js";
+
 const $dialog = $("#help-dialog");
 
 async function showDialog() {
+    utils.closeActiveDialog();
+
     glob.activeDialog = $dialog;
 
     $dialog.modal();