chore: Small refactoring of unneeded getter call

backend/src/main/java/rocks/inspectit/gepard/agentmanager/configuration/controller/ConfigurationController.java

@@ -27,7 +27,7 @@ public ResponseEntity<InspectitConfiguration> getAgentConfiguration() {
       return ResponseEntity.noContent().build();
     }
 
-    return ResponseEntity.ok().body(configurationService.getConfiguration());
+    return ResponseEntity.ok().body(configuration);
   }
 
   @PutMapping