Eventing: fix error msg for negative testcase

Change-Id: I13e2014b1d6a74623b911e63893d4cfdf792475d
Reviewed-on: http://review.couchbase.org/c/testrunner/+/160438
Tested-by: Chanabasappa Ghali <chanabasappa.ghali@couchbase.com>
Reviewed-by: Chanabasappa Ghali <chanabasappa.ghali@couchbase.com>

pytests/eventing/eventing_negative.py

@@ -490,7 +490,7 @@ def test_field_boundary_update_for_deployed_function(self):
         try:
             self.rest.set_settings_for_function(self.function_name,update_body)
         except Exception as e:
-            if "ERR_APP_ALREADY_DEPLOYED" not in str(e):
+            if "ERR_INVALID_CONFIG" not in str(e):
                 raise Exception("Feed boundary updated when app is deployed")
         self.undeploy_and_delete_function(body)