Fix VM export info schema indentation.

coriolis/schemas/vm_export_info_schema.json

@@ -99,8 +99,8 @@
                 "$ref": "#/definitions/numberOrString"
               },
               "storage_backend_identifier": {
-                  "type": "string",
-                  "help": "A string identifier for the storage system the disk is hosted on."
+                "type": "string",
+                "help": "A string identifier for the storage system the disk is hosted on."
               },
               "allocation_type": {
                 "type": "string",