update macro

Author: ohmayr

gapic/templates/tests/unit/gapic/%name_%version/%sub/test_macros.j2

@@ -1882,8 +1882,8 @@ def test_{{ method_name }}_empty_call():
 {%- set named_transports = { 'rest': service.client_name, 'grpc': service.client_name, 'grpc_asyncio': service.async_client_name, 'rest_asyncio': service.async_client_name}
 -%}
 def test_transport_kind_{{transport_name}}():
-    transport = {{ named_transports[transport_name] }}.get_transport_class(
-        "{{transport_name}}")(credentials={{credentials}}
+    transport = {{ named_transports[transport_name] }}.get_transport_class("{{transport_name}}")(
+        credentials={{credentials}}
     )
     assert transport.kind == "{{ transport_name }}"
 {% endmacro %}