D29683: screenshot: use QImage to decode the received screenshot image

[Aleix Pol Gonzalez]

apol created this revision.
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REVISION SUMMARY
  Instead of converting and parsing a different format.

TEST PLAN
  Took screenshots with spectacle, they looked alright.

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D29683

AFFECTED FILES
  effects/screenshot/screenshot.cpp
  effects/screenshot/screenshot.h

To: apol, #kwin
Cc: kwin, Orage, cacarry, LeGast00n, The-Feren-OS-Dev, cblack, jraleigh, zachus, fbampaloukas, mkulinski, ragreen, jackyalcine, iodelay, crozbo, bwowk, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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