D23748: [wayland] Avoid compare to unintialised value in keyboard repeat

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REVISION SUMMARY
  If we get a key event for which
  
  if (m_xkb->shouldKeyRepeat(key) &&
  waylandServer()->seat()->keyRepeatDelay() != 0) fails
  
  m_key will be unitialised and on release we have a compare against
  unitialised memory.
  
  Won't do any harm, it'll just stop a timer that isn't running, but
  valgrind complains.
  
  0 is the value QKeyEvent uses when nativeScanCode is unknown so a safe
  initial values.

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D23748

AFFECTED FILES
  keyboard_repeat.h

To: davidedmundson, #kwin
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