erp5_core: Hide select from Listbox used in mass workflow action

this is not passed correctly in submission script anyway, so selection
is not taken into account in this case

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/Folder_modifyDocumentListStatusDialog/listbox.xml

@@ -16,6 +16,7 @@
                 <string>enabled</string>
                 <string>lines</string>
                 <string>list_method</string>
+                <string>select</string>
                 <string>selection_name</string>
               </list>
             </value>
@@ -133,6 +134,10 @@
                       <persistent> <string encoding="base64">AAAAAAAAAAY=</string> </persistent>
                     </value>
                 </item>
+                <item>
+                    <key> <string>select</string> </key>
+                    <value> <int>0</int> </value>
+                </item>
                 <item>
                     <key> <string>selection_name</string> </key>
                     <value> <string>folder_changestate_selection</string> </value>