Fix flattened custom patchable resources (#782)
Fix flattened custom patchable resources (#782)

Signed-off-by: Modular Magician <86ce7da8ad74b1c583667a2bebd347455fa06219@google.com>
hashicorp/terraform-provider-google-beta,hashicorp/terraform-provider-google-beta,hashicorp/terraform-provider-google-beta,hashicorp/terraform-provider-google-beta