calendar: fix permissions on group_calendar_workflow transitions

The workflow method transitions were configured to use a different
guard from the user action transitions.

"Manager bypass" was not set

bt5/erp5_calendar/WorkflowTemplateItem/portal_workflow/group_calendar_workflow.xml

@@ -48,7 +48,7 @@
         </item>
         <item>
             <key> <string>manager_bypass</string> </key>
-            <value> <int>0</int> </value>
+            <value> <int>1</int> </value>
         </item>
         <item>
             <key> <string>portal_type</string> </key>

bt5/erp5_calendar/WorkflowTemplateItem/portal_workflow/group_calendar_workflow/transition_cancel.xml

@@ -42,15 +42,15 @@
         <item>
             <key> <string>guard_permission</string> </key>
             <value>
-              <tuple>
-                <string>Modify portal content</string>
-              </tuple>
+              <tuple/>
             </value>
         </item>
         <item>
             <key> <string>guard_role</string> </key>
             <value>
-              <tuple/>
+              <tuple>
+                <string>Assignee</string>
+              </tuple>
             </value>
         </item>
         <item>

bt5/erp5_calendar/WorkflowTemplateItem/portal_workflow/group_calendar_workflow/transition_confirm.xml

@@ -42,15 +42,15 @@
         <item>
             <key> <string>guard_permission</string> </key>
             <value>
-              <tuple>
-                <string>Modify portal content</string>
-              </tuple>
+              <tuple/>
             </value>
         </item>
         <item>
             <key> <string>guard_role</string> </key>
             <value>
-              <tuple/>
+              <tuple>
+                <string>Assignee</string>
+              </tuple>
             </value>
         </item>
         <item>

bt5/erp5_calendar/WorkflowTemplateItem/portal_workflow/group_calendar_workflow/transition_delete.xml

@@ -42,15 +42,15 @@
         <item>
             <key> <string>guard_permission</string> </key>
             <value>
-              <tuple>
-                <string>Modify portal content</string>
-              </tuple>
+              <tuple/>
             </value>
         </item>
         <item>
             <key> <string>guard_role</string> </key>
             <value>
-              <tuple/>
+              <tuple>
+                <string>Assignee</string>
+              </tuple>
             </value>
         </item>
         <item>