fix: do not re-neable AuthorizationService if it is already enabled

The enable action needs the realm-wide "modify client" permission,
which restricted admins with the fine-grained-authz feature do not have.

This causes a "forbidden" exception when try try to save a client
with Authorization already enabled, even if the "enable" action
does nothing since it was already enabled.

Fixes #22938

Signed-off-by: Vojtěch Boček <vbocek@gmail.com>

services/src/main/java/org/keycloak/authorization/admin/AuthorizationService.java

@@ -64,8 +64,10 @@ public class AuthorizationService {
     }
 
     public void enable(boolean newClient) {
+        if (!isEnabled()) {
             this.resourceServer = getResourceServerService().create(newClient);
         }
+    }
 
     public void disable() {
         if (isEnabled()) {