Fix comment indentation and whitespace

The previous layout satisfied pgindent but failed the git whitespace
check.  Fix by not putting the comment first in the line, which
pgindent does not handle well.

Discussion: https://www.postgresql.org/message-id/flat/480e3c67-b703-46ff-a418-d3b481d68372%40enterprisedb.com

contrib/postgres_fdw/connection.c

@@ -449,7 +449,7 @@ connect_pg_server(ForeignServer *server, UserMapping *user)
 
 		/* OK to make connection */
 		conn = libpqsrv_connect_params(keywords, values,
-									    /* expand_dbname = */ false,
+									   false,	/* expand_dbname */
 									   PG_WAIT_EXTENSION);
 
 		if (!conn || PQstatus(conn) != CONNECTION_OK)