fix(k8s-service-binding): add missing ConfigItem in the service bindi…

…ng configuration

Follows up quarkusio#13737 (comment)

extensions/kubernetes-service-binding/runtime/src/main/java/io/quarkus/kubernetes/service/binding/runtime/KubernetesServiceBindingConfig.java

@@ -12,6 +12,7 @@ public class KubernetesServiceBindingConfig {
     /**
      * If enabled, Service Bindings will be looked in the file system
      */
+    @ConfigItem
     public boolean enabled;
 
     /**