[Qt] Unreviewed gardening. Update platform specific expectations.

* platform/qt-5.0-wk1/fast/loader/show-only-one-beforeunload-dialog-expected.txt: Added after r152941.
* platform/qt-5.0-wk1/http/tests/misc/iframe-beforeunload-dialog-matching-ancestor-securityorigin-expected.txt: Added after r152941.
* platform/qt-5.0-wk2/fast/multicol/shrink-to-column-height-for-pagination-expected.png: Removed.
* platform/qt/fast/multicol/shrink-to-column-height-for-pagination-expected.png: Added after r152911.
* platform/qt/fast/multicol/shrink-to-column-height-for-pagination-expected.txt: Renamed from LayoutTests/platform/qt-5.0-wk2/fast/multicol/shrink-to-column-height-for-pagination-expected.txt.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@152960 268f45cc-cd09-0410-ab3c-d52691b4dbfc