[FIX] web: Set focus on first field when opening a modal

This will improve the onbarding of project and the usability in general.

Project: When creating a project a small modal opens with one or more fields, and you have to click on it just to type the project name.

Usability: one many2one (and others), when clicking on "Create and Edit", the focus is set on the first field.

addons/web/static/src/js/views/form_common.js

@@ -930,8 +930,8 @@ var FormViewDialog = ViewDialog.extend({
             var fragment = document.createDocumentFragment();
             self.view_form.appendTo(fragment).then(function () {
                 self.view_form.do_show().then(function() {
-                    self.view_form.autofocus();
                     _super().$el.append(fragment);
+                    self.view_form.autofocus();
                 });
             });
         });