Related #82088: removed last css aliases in hxx

* Only unfixed header namespace alias in
  ConnectionLog.hxx:
  LogLevel = ::com::sun::star::logging::LogLevel

Change-Id: I48c941a4762830f2265c8241f4c1695a43ec891a
Reviewed-on: https://gerrit.libreoffice.org/11333
Reviewed-by: David Tardon <dtardon@redhat.com>
Tested-by: David Tardon <dtardon@redhat.com>