Remove field because relation between person Assignments and Group Calendar is obsolete

bt5/erp5_base/SkinTemplateItem/portal_skins/erp5_base/Assignment_view.xml

@@ -75,7 +75,6 @@
                         <string>my_destination_project_title</string>
                         <string>my_start_date</string>
                         <string>my_stop_date</string>
-                        <string>my_calendar_title_list</string>
                       </list>
                     </value>
                 </item>

bt5/erp5_base/SkinTemplateItem/portal_skins/erp5_base/Assignment_view/my_calendar_title_list.xml

-<?xml version="1.0"?>
-<ZopeData>
-  <record id="1" aka="AAAAAAAAAAE=">
-    <pickle>
-      <global name="ProxyField" module="Products.ERP5Form.ProxyField"/>
-    </pickle>
-    <pickle>
-      <dictionary>
-        <item>
-            <key> <string>delegated_list</string> </key>
-            <value>
-              <list/>
-            </value>
-        </item>
-        <item>
-            <key> <string>id</string> </key>
-            <value> <string>my_calendar_title_list</string> </value>
-        </item>
-        <item>
-            <key> <string>message_values</string> </key>
-            <value>
-              <dictionary>
-                <item>
-                    <key> <string>external_validator_failed</string> </key>
-                    <value> <string>The input failed the external validator.</string> </value>
-                </item>
-              </dictionary>
-            </value>
-        </item>
-        <item>
-            <key> <string>overrides</string> </key>
-            <value>
-              <dictionary>
-                <item>
-                    <key> <string>field_id</string> </key>
-                    <value> <string></string> </value>
-                </item>
-                <item>
-                    <key> <string>form_id</string> </key>
-                    <value> <string></string> </value>
-                </item>
-                <item>
-                    <key> <string>target</string> </key>
-                    <value> <string></string> </value>
-                </item>
-              </dictionary>
-            </value>
-        </item>
-        <item>
-            <key> <string>tales</string> </key>
-            <value>
-              <dictionary>
-                <item>
-                    <key> <string>field_id</string> </key>
-                    <value> <string></string> </value>
-                </item>
-                <item>
-                    <key> <string>form_id</string> </key>
-                    <value> <string></string> </value>
-                </item>
-                <item>
-                    <key> <string>target</string> </key>
-                    <value> <string></string> </value>
-                </item>
-              </dictionary>
-            </value>
-        </item>
-        <item>
-            <key> <string>values</string> </key>
-            <value>
-              <dictionary>
-                <item>
-                    <key> <string>field_id</string> </key>
-                    <value> <string>my_calendar_title_list</string> </value>
-                </item>
-                <item>
-                    <key> <string>form_id</string> </key>
-                    <value> <string>Assignment_viewFieldLibrary</string> </value>
-                </item>
-                <item>
-                    <key> <string>target</string> </key>
-                    <value> <string>Click to edit the target</string> </value>
-                </item>
-              </dictionary>
-            </value>
-        </item>
-      </dictionary>
-    </pickle>
-  </record>
-</ZopeData>