chore: correct .repo-metadata (#93)

Fixes #87

Author: tritone

.repo-metadata.json

@@ -1,5 +1,5 @@
 {
- "api_shortname": "storage-transfer",
+ "api_shortname": "storagetransfer",
  "name_pretty": "Storage Transfer Service",
  "product_documentation": "https://cloud.google.com/storage-transfer-service",
  "api_description": "Secure, low-cost services for transferring data from cloud or on-premises sources.",
@@ -13,4 +13,4 @@
  "api_id": "storagetransfer.googleapis.com",
  "library_type": "GAPIC_AUTO",
  "requires_billing": true
-}
+}