fix: handle repeated fields in method signatures (#445)

Co-authored-by: Dov Shlachter <dovs@google.com>

gapic/templates/%namespace/%name_%version/%sub/services/%service/client.py.j2

@@ -338,12 +338,12 @@ class {{ service.client_name }}(metaclass={{ service.client_name }}Meta):
             # If we have keyword arguments corresponding to fields on the
             # request, apply these.
             {% endif -%}
-            {%- for key, field in method.flattened_fields.items() if not(field.repeated and method.input.ident.package != method.ident.package) %}
+            {%- for key, field in method.flattened_fields.items() if not(field.repeated or method.input.ident.package != method.ident.package) %}
             if {{ field.name }} is not None:
                 request.{{ key }} = {{ field.name }}
             {%- endfor %}
             {# They can be _extended_, however -#}
-            {%- for key, field in method.flattened_fields.items() if (field.repeated and method.input.ident.package != method.ident.package) %}
+            {%- for key, field in method.flattened_fields.items() if field.repeated %}
             if {{ field.name }}:
                 request.{{ key }}.extend({{ field.name }})
             {%- endfor %}