Drop remains of X11 related code from x11info class

Review Request #130130 - Created May 15, 2017 and updated

Information
Valeriy Malov
wacomtablet
releng3.0
Reviewers
wacomtablet

Removed a couple of unused QX11Info calls and replaced Xrandr call for rotation with QScreen version

Checked if tablet mapping and KCM affected by rotated screen

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