slapos_panel: desactivat the Supply action

Force user to supply from the Allocation Supply configuration.
otherwise, alarms will clean up the manually added Software Installation.

master/bt5/slapos_panel/ActionTemplateItem/portal_types/Compute%20Node/supply_slapos.xml

@@ -66,7 +66,7 @@
         </item>
         <item>
             <key> <string>visible</string> </key>
-            <value> <int>1</int> </value>
+            <value> <int>0</int> </value>
         </item>
       </dictionary>
     </pickle>