Fix typo on required cloud field

Didn't catch this one because I tested the validations on the
original version of the v2.0.1 PR and didn't re-test when adding
additional properties based on feedback.

v2.0.1/admin-schema.json

@@ -646,7 +646,7 @@
                 "enabled": {"type": "boolean"},
                 "host": {
                     "type": "object",
-                    "required": ["name", "storage_servce", "storage_location"],
+                    "required": ["name", "storage_service", "storage_location"],
                     "properties": {
                         "name": {
                             "description": "Name of the cloud storage provider.",