fix gcp_spanner_database delete

gcp_spanner_database erroneously used LRO handling on delete,
rather than a standard synchronous function. One side effect
was not catching 404s as a not found error code.

plugins/modules/gcp_spanner_database.py

@@ -286,7 +286,7 @@ def extra_statements_update(module, request, response):
 
 def delete(module, link):
     auth = GcpSession(module, 'spanner')
-    return wait_for_operation(module, auth.delete(link))
+    return return_if_object(module, auth.delete(link))
 
 
 def resource_to_request(module):

tests/integration/targets/gcp_spanner_database/aliases

@@ -1,2 +1 @@
 cloud/gcp
-unsupported