Stop considering PolicyQueryCommand to be authorization-changing, whi…

…ch it is not.

Signed-off-by: Yufei Cai <yufei.cai@bosch-si.com>

services/concierge/enforcement/src/main/java/org/eclipse/ditto/services/concierge/enforcement/PolicyCommandEnforcement.java

@@ -317,7 +317,7 @@ public Class<PolicyCommand> getCommandClass() {
 
         @Override
         public boolean changesAuthorization(final PolicyCommand signal) {
-            return true;
+            return signal instanceof PolicyModifyCommand;
         }
 
         @Override