trade: make dialogs section category proxy field use core's one

bt5/erp5_trade/SkinTemplateItem/portal_skins/erp5_trade/Base_viewTradeFieldLibrary/my_dialog_mode_section_category.xml

@@ -9,12 +9,7 @@
         <item>
             <key> <string>delegated_list</string> </key>
             <value>
-              <list>
-                <string>required</string>
-                <string>title</string>
-                <string>default</string>
-                <string>items</string>
-              </list>
+              <list/>
             </value>
         </item>
         <item>
@@ -55,12 +50,6 @@
             <key> <string>tales</string> </key>
             <value>
               <dictionary>
-                <item>
-                    <key> <string>default</string> </key>
-                    <value>
-                      <persistent> <string encoding="base64">AAAAAAAAAAI=</string> </persistent>
-                    </value>
-                </item>
                 <item>
                     <key> <string>field_id</string> </key>
                     <value> <string></string> </value>
@@ -69,12 +58,6 @@
                     <key> <string>form_id</string> </key>
                     <value> <string></string> </value>
                 </item>
-                <item>
-                    <key> <string>items</string> </key>
-                    <value>
-                      <persistent> <string encoding="base64">AAAAAAAAAAM=</string> </persistent>
-                    </value>
-                </item>
                 <item>
                     <key> <string>target</string> </key>
                     <value> <string></string> </value>
@@ -88,54 +71,20 @@
               <dictionary>
                 <item>
                     <key> <string>field_id</string> </key>
-                    <value> <string>my_list_field</string> </value>
+                    <value> <string>my_dialog_mode_section_category</string> </value>
                 </item>
                 <item>
                     <key> <string>form_id</string> </key>
                     <value> <string>Base_viewFieldLibrary</string> </value>
                 </item>
-                <item>
-                    <key> <string>required</string> </key>
-                    <value> <int>1</int> </value>
-                </item>
                 <item>
                     <key> <string>target</string> </key>
                     <value> <string>Click to edit the target</string> </value>
                 </item>
-                <item>
-                    <key> <string>title</string> </key>
-                    <value> <string>Section Category</string> </value>
-                </item>
               </dictionary>
             </value>
         </item>
       </dictionary>
     </pickle>
   </record>
-  <record id="2" aka="AAAAAAAAAAI=">
-    <pickle>
-      <global name="TALESMethod" module="Products.Formulator.TALESField"/>
-    </pickle>
-    <pickle>
-      <dictionary>
-        <item>
-            <key> <string>_text</string> </key>
-            <value> <string>preferences/getPreferredSectionCategory</string> </value>
-        </item>
-      </dictionary>
-    </pickle>
-  </record>
-  <record id="3" aka="AAAAAAAAAAM=">
-    <pickle>
-      <global name="TALESMethod" module="Products.Formulator.TALESField"/>
-    </pickle>
-    <pickle>
-      <dictionary>
-        <item>
-            <key> <string>_text</string> </key>
-            <value> <string>python: here.portal_categories.group.getCategoryChildIndentedTitleItemList(base=1)</string> </value>
-        </item>
-      </dictionary>
-    </pickle>
-  </record>
 </ZopeData>