filesystem: correct the pool name in the ux backend handler

In the expandstorage handler pool name is incorrect,

Rook adds the filesystemName prefix to every datapool,
which was missing in the storageclass parameter
https://github.com/rook/rook/blob/44e96c8ab67a27121354a04b121b7f16b6a38894/pkg/operator/ceph/file/filesystem.go#L321

Signed-off-by: parth-gr <paarora@redhat.com>

services/ux-backend/handlers/expandstorage/handler.go

@@ -269,7 +269,7 @@ func createCephFilesystemStorageClass(w http.ResponseWriter, r *http.Request, cl
 		Parameters: map[string]string{
 			"clusterID": namespace,
 			"fsName":    filesystemName,
-			"pool":      poolName,
+			"pool":      fmt.Sprintf("%s-%s", filesystemName, poolName),
 			"csi.storage.k8s.io/provisioner-secret-name":            "rook-csi-cephfs-provisioner",
 			"csi.storage.k8s.io/provisioner-secret-namespace":       namespace,
 			"csi.storage.k8s.io/node-stage-secret-name":             "rook-csi-cephfs-node",