erp5_oauth2_authorisation: Make logged_in_once usable as ERP5Form action

Base_callDialogMethod may not provide REQUEST nor RESPONSE, and may provide
other arguments. Make the former optional, ignore the latter, and fallback
on RequestContainer's magic when REQUEST is None.

bt5/erp5_oauth2_authorisation/SkinTemplateItem/portal_skins/erp5_oauth2_authorisation/logged_in_once.py

@@ -9,6 +9,11 @@ portal = context.getPortalObject()
 if portal.portal_skins.updateSkinCookie():
   portal.setupCurrentSkin()
 
+if REQUEST is None:
+  # BBB: support Base_callDialogMethod-style caller
+  REQUEST = context.REQUEST
+  # Note: RESPONSE agument is present for API consistency purposes, but unused.
+  # So do not bother setting it here.
 environ = REQUEST.environ
 if (
   environ['REQUEST_METHOD'] != 'POST' or

bt5/erp5_oauth2_authorisation/SkinTemplateItem/portal_skins/erp5_oauth2_authorisation/logged_in_once.xml

@@ -50,7 +50,7 @@
         </item>
         <item>
             <key> <string>_params</string> </key>
-            <value> <string>REQUEST, RESPONSE</string> </value>
+            <value> <string>REQUEST=None, RESPONSE=None, **kw</string> </value>
         </item>
         <item>
             <key> <string>_proxy_roles</string> </key>