[FIX] web_editor: run rte tests in post_install

The test begins by opening the webclient which default view is the
kanban view of the apps. However, by running this test at the web
module installation, web_kanban is not yet installed.

addons/web_editor/tests/test_ui.py

@@ -2,6 +2,10 @@ import openerp.tests
 
 
 class TestUi(openerp.tests.HttpCase):
+
+    post_install = True
+    at_install = False
+
     def test_01_admin_rte(self):
         self.phantom_js("/web", "odoo.__DEBUG__.services['web.Tour'].run('rte', 'test')", "odoo.__DEBUG__.services['web.Tour'].tours.rte", login='admin')