Save machine pools even when action is not create

edit/provisioning.cattle.io.cluster/rke2.vue

@@ -731,6 +731,10 @@ export default {
           entry.config = neu;
           entry.pool.machineConfigRef.name = neu.metadata.name;
           entry.create = false;
+        } else {
+          const response = await entry.config.save();
+
+          entry.config = response;
         }
 
         if ( !entry.pool.hostnamePrefix ) {