trade/pdm: don't pre-select section_category in report

most trade and PDM report are about "what quantity of resources do we
have here", in most uses cases, we are not concerned about who is the
owner of these, so it's probably better to not select these by default.

bt5/erp5_pdm/SkinTemplateItem/portal_skins/erp5_pdm/Base_viewPDMFieldLibrary/my_dialog_mode_section_category.xml

@@ -9,7 +9,9 @@
         <item>
             <key> <string>delegated_list</string> </key>
             <value>
-              <list/>
+              <list>
+                <string>default</string>
+              </list>
             </value>
         </item>
         <item>
@@ -69,6 +71,10 @@
             <key> <string>values</string> </key>
             <value>
               <dictionary>
+                <item>
+                    <key> <string>default</string> </key>
+                    <value> <string></string> </value>
+                </item>
                 <item>
                     <key> <string>field_id</string> </key>
                     <value> <string>my_dialog_mode_section_category</string> </value>

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

@@ -9,7 +9,9 @@
         <item>
             <key> <string>delegated_list</string> </key>
             <value>
-              <list/>
+              <list>
+                <string>default</string>
+              </list>
             </value>
         </item>
         <item>
@@ -50,6 +52,10 @@
             <key> <string>tales</string> </key>
             <value>
               <dictionary>
+                <item>
+                    <key> <string>default</string> </key>
+                    <value> <string></string> </value>
+                </item>
                 <item>
                     <key> <string>field_id</string> </key>
                     <value> <string></string> </value>
@@ -69,6 +75,10 @@
             <key> <string>values</string> </key>
             <value>
               <dictionary>
+                <item>
+                    <key> <string>default</string> </key>
+                    <value> <string></string> </value>
+                </item>
                 <item>
                     <key> <string>field_id</string> </key>
                     <value> <string>my_dialog_mode_section_category</string> </value>