app: fixed child_selector in controlbar (broke on IOS and opera)

js/erp5_loader.js

@@ -1317,13 +1317,12 @@
     pass = function (container) {
       return {
         "fragment": container,
-        "child_selector": container.firstElementChild || container,
+        "child_selector": container.querySelector("div") || container,
         "add_on_dom": spec.target === "document"
       };
     };
 
     container = document.createDocumentFragment();
-    slot = spec.slot;
 
     switch (spec.wrap) {
     case "fragment":
@@ -1332,6 +1331,7 @@
       class_list = spec.class_list;
       break;
     default:
+      slot = spec.slot;
       class_list = (slot ? "" : "ui-controlbar ") + (spec.class_list || "");
       break;
     }