budget: add proxy role on interaction script

this interaction adjust membership criterions when variation
categories is changed, but we don't really need security
restriction in the interaction, because security is already
checked when setting variation categories.

bt5/erp5_budget/WorkflowTemplateItem/portal_workflow/budget_interaction_workflow/script_setMembershipCriterionCategoryListFromVariationCategory.xml

@@ -52,6 +52,14 @@
             <key> <string>_params</string> </key>
             <value> <string>sci</string> </value>
         </item>
+        <item>
+            <key> <string>_proxy_roles</string> </key>
+            <value>
+              <tuple>
+                <string>Manager</string>
+              </tuple>
+            </value>
+        </item>
         <item>
             <key> <string>id</string> </key>
             <value> <string>script_setMembershipCriterionCategoryListFromVariationCategory</string> </value>