D16921: [wayland] WlShell cache the pre-maximised geometry before going fullscreen

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REVISION SUMMARY
  In shell surface, maximise mode and fullscreen are exclusive
  fullscreen->toplevel should restore the state we had before maximising

TEST PLAN
  testMaximisedToFullscreen unit test

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D16921

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