item: move this field library field from erp5_trade to erp5_item since it is only used there

bt5/erp5_item/SkinTemplateItem/portal_skins/erp5_item_trade/Base_viewTradeFieldLibrary.xml

@@ -104,6 +104,7 @@
                         <string>my_dialog_mode_portal_type</string>
                         <string>my_dialog_mode_reference</string>
                         <string>my_dialog_mode_title</string>
+                        <string>my_dialog_mode_delivery_line_quantity_unit</string>
                       </list>
                     </value>
                 </item>

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

@@ -303,7 +303,6 @@
                         <string>my_view_mode_listbox_read_only_expiration_date</string>
                         <string>my_view_mode_preferred_tax_use_list</string>
                         <string>my_report_mode_node_category</string>
-                        <string>my_dialog_mode_delivery_line_quantity_unit</string>
                       </list>
                     </value>
                 </item>