fix(kded): read rotated output size
Summary:
When adjusting positions on config read respect the rotation value on reading
in the output size.
BUG: 413627
CCBUG: 396354
FIXED-IN: 5.17.3
Test Plan: User tested it on a setup with one rotated output and two non-rotated outputs.
Reviewers: Plasma, davidedmundson
Reviewed By: Plasma, davidedmundson
Subscribers: davidedmundson, gmassullo, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D25062