Followup to r1559032: fix a style nit.  No functional change.

* subversion/svn/log-cmd.c
  (svn_cl__log_entry_receiver_xml): Use indented brackets per our style


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1559035 13f79535-47bb-0310-9956-ffa450edef68