fix: remove extra space before_pb_options

Author: busunkim96

gapic/ads-templates/%namespace/%name/%version/%sub/types/_enum.py.j2

@@ -1,7 +1,7 @@
 class {{ enum.name }}({{ p }}.Enum):
     r"""{{ enum.meta.doc|rst(indent=4) }}"""
     {% if enum.enum_pb.HasField("options") %}
-     _pb_options = {{ enum.options_dict }}
+    _pb_options = {{ enum.options_dict }}
     {% endif %}
     {% for enum_value in enum.values %}
     {{ enum_value.name }} = {{ enum_value.number }}

gapic/templates/%namespace/%name_%version/%sub/types/_enum.py.j2

@@ -1,7 +1,7 @@
 class {{ enum.name }}({{ p }}.Enum):
     r"""{{ enum.meta.doc|rst(indent=4) }}"""
     {% if enum.enum_pb.HasField("options") %}
-     _pb_options = {{ enum.options_dict }}
+    _pb_options = {{ enum.options_dict }}
     {% endif %}
     {% for enum_value in enum.values %}
     {{ enum_value.name }} = {{ enum_value.number }}