slapos_panel: Keep default as disabled on "Is Compute Node Payable"

  Configure payable required extra effort, and we should keep default simple.

master/bt5/slapos_panel/SkinTemplateItem/portal_skins/slapos_panel/Person_viewAddVirtualMasterDialog/your_is_compute_node_payable.xml

@@ -10,7 +10,6 @@
             <key> <string>delegated_list</string> </key>
             <value>
               <list>
-                <string>default</string>
                 <string>title</string>
               </list>
             </value>
@@ -64,10 +63,6 @@
             <key> <string>values</string> </key>
             <value>
               <dictionary>
-                <item>
-                    <key> <string>default</string> </key>
-                    <value> <int>1</int> </value>
-                </item>
                 <item>
                     <key> <string>field_id</string> </key>
                     <value> <string>my_checkbox</string> </value>