trade: delegate size on Base_viewTradeFieldLibrary/my_dialog_mode_portal_type

Let's be consistent and use the default size.

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

@@ -11,7 +11,6 @@
             <value>
               <list>
                 <string>items</string>
-                <string>size</string>
                 <string>title</string>
               </list>
             </value>
@@ -72,6 +71,10 @@
                     <key> <string>target</string> </key>
                     <value> <string></string> </value>
                 </item>
+                <item>
+                    <key> <string>title</string> </key>
+                    <value> <string></string> </value>
+                </item>
               </dictionary>
             </value>
         </item>
@@ -93,10 +96,6 @@
                       <list/>
                     </value>
                 </item>
-                <item>
-                    <key> <string>size</string> </key>
-                    <value> <int>5</int> </value>
-                </item>
                 <item>
                     <key> <string>target</string> </key>
                     <value> <string>Click to edit the target</string> </value>