D15768: Fix using kscreen with qxl, follow the preferred mode

[Aleix Pol Gonzalez]

apol created this revision.
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REVISION SUMMARY
  When using a the qxl driver (for virtual machines), we'll be getting resizes of
  the display by changes on the preferred output id.
  The status quo is that if one runs `xrandr --output Virtual-0 --preferred` after
  resizing the screen, kscreen will be set on the right outputId and just work.
  This shouldn't have an impact on normal use-cases because it's very strange that
  the preferred mode changes at runtime.

TEST PLAN
  Ran it on my laptop, nothing broke. Will test on QXL in a bit.

REPOSITORY
  R104 KScreen

BRANCH
  preferred (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D15768

AFFECTED FILES
  kded/daemon.cpp
  kded/daemon.h

To: apol, #plasma
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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