slapos_subscription_request: constraint: no Organisation as source_section

master/bt5/slapos_subscription_request/PropertySheetTemplateItem/portal_property_sheets/SlapOSSubscriptionRequestConstraint/source_section_constraint.xml

@@ -28,7 +28,7 @@
         </item>
         <item>
             <key> <string>constraint_portal_type</string> </key>
-            <value> <string>python: (\'Organisation\', \'Person\')</string> </value>
+            <value> <string>python: (\'Person\',)</string> </value>
         </item>
         <item>
             <key> <string>description</string> </key>