[PUSHED] Simple string cleanup in backingwindow.cxx

[Thomas Arnhold (via Code Review)]

Hi,

Thank you for your patch!  It has been merged to LibreOffice.

If you are interested in details, please visit

    https://gerrit.libreoffice.org/3377

Approvals:
  Thomas Arnhold: Verified; Looks good to me, approved


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Gerrit-MessageType: merged
Gerrit-Change-Id: I5bd7152f0dfdc5459e9a754af1e8c65234ff606d
Gerrit-PatchSet: 3
Gerrit-Project: core
Gerrit-Branch: master
Gerrit-Owner: Olivier Hallot <olivier.hallot at edx.srv.br>
Gerrit-Reviewer: Thomas Arnhold <thomas at arnhold.org>