erp5_email_reader: attachment field follows the changes in Event_view.

The attachment field now uses the property aggregate_document_title of Event.

bt5/erp5_email_reader/SkinTemplateItem/portal_skins/erp5_email_reader/EmailThread_view.xml

@@ -78,7 +78,7 @@
                     <value>
                       <list>
                         <string>attachment_list</string>
-                        <string>my_aggregate_title_list</string>
+                        <string>my_aggregate_document_title_list</string>
                         <string>my_text_format</string>
                       </list>
                     </value>

bt5/erp5_email_reader/SkinTemplateItem/portal_skins/erp5_email_reader/EmailThread_view/my_aggregate_title_list.xml → bt5/erp5_email_reader/SkinTemplateItem/portal_skins/erp5_email_reader/EmailThread_view/my_aggregate_document_title_list.xml

@@ -14,7 +14,7 @@
         </item>
         <item>
             <key> <string>id</string> </key>
-            <value> <string>my_aggregate_title_list</string> </value>
+            <value> <string>my_aggregate_document_title_list</string> </value>
         </item>
         <item>
             <key> <string>message_values</string> </key>
@@ -71,7 +71,7 @@
               <dictionary>
                 <item>
                     <key> <string>field_id</string> </key>
-                    <value> <string>my_aggregate_title_list</string> </value>
+                    <value> <string>my_aggregate_document_title_list</string> </value>
                 </item>
                 <item>
                     <key> <string>form_id</string> </key>