[FIX] web: update buttons in editable list view when no changes

When I introduced this line in 374295b, I was working on the form
view and didn't realize I would be breaking the editable list view.

The _setMode function only updates the buttons when given the id of
a record. Since I was working on a form view at the time, I didn't
need to give a recordID to make it work since the default ID of a
form view is the id of the record itself. However, in editable list
view, the id of the view is a list of ids, so the buttons would not
be updated in this case.

addons/web/static/src/js/views/basic/basic_controller.js

@@ -423,7 +423,7 @@ var BasicController = AbstractController.extend(FieldManagerMixin, {
             });
             if (!options.stayInEdit) {
                 saveDef = saveDef.then(function (fieldNames) {
-                    var def = fieldNames.length ? self._confirmSave(recordID) : self._setMode('readonly');
+                    var def = fieldNames.length ? self._confirmSave(recordID) : self._setMode('readonly', recordID);
                     return def.then(function () {
                         return fieldNames;
                     });

addons/web/static/tests/views/list_tests.js

@@ -136,7 +136,7 @@ QUnit.module('Views', {
     });
 
     QUnit.test('simple editable rendering', function (assert) {
-        assert.expect(9);
+        assert.expect(12);
 
         var list = createView({
             View: ListView,
@@ -164,6 +164,15 @@ QUnit.module('Views', {
             "should have a visible save button");
         assert.ok(list.$buttons.find('.o_list_button_discard').is(':visible'),
             "should have a visible discard button");
+
+        list.$buttons.find('.o_list_button_save').click();
+
+        assert.ok(list.$buttons.find('.o_list_button_add').is(':visible'),
+            "should have a visible Create button");
+        assert.ok(!list.$buttons.find('.o_list_button_save').is(':visible'),
+            "should not have a visible save button");
+        assert.ok(!list.$buttons.find('.o_list_button_discard').is(':visible'),
+            "should not have a visible discard button");
         list.destroy();
     });