[Okular] Bug 387282: Highlighting of search results lost when rotating page

Summary:
The highlights were removed when rotating the page, also the RotaionJob::rotationMatrix function was not rotating the Highlihgts correctly.
I removed the deletion and modified the rotaionMatrix function by making it shorter and adding a translation after the rotatin. I tried different rotations and they are working fine.
BUG: 387282

Reviewers: #okular

Subscribers: aacid, ngraham, #okular

Tags: #okular

Differential Revision: https://phabricator.kde.org/D11901