D16920: [wayland] Fix ShellClient removing borders to give the same window geometry

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REVISION SUMMARY
  In the case of going from maximised to fullscreen when decorated the
  geometry of the window (as far as kwin is concerned) could remain static
  if we have no panels, but we still need a newly resized buffer from the
  client.
  
  When checking if we need a new buffer or to perform the geometry change
  directly we need to compare the client size without borders.

TEST PLAN
  maximizedToFullScreen unit test

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D16920

AFFECTED FILES
  shell_client.cpp

To: davidedmundson, #kwin
Cc: kwin, mkulinski, ragreen, jackyalcine, Pitel, iodelay, bwowk, ZrenBot, ngraham, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart