[iOS] Update expected results for LayoutTests/{compositing, css1, css2.1, css3, cssom}
https://bugs.webkit.org/show_bug.cgi?id=139467

Rubber-stamped by Zalan Bujtas.

* platform/ios-simulator-wk2/TestExpectations:
* platform/ios-simulator-wk2/compositing/absolute-inside-out-of-view-fixed-expected.txt: Copied from LayoutTests/platform/ios-simulator/compositing/absolute-inside-out-of-view-fixed-expected.txt.
* platform/ios-simulator-wk2/compositing/backing/backface-visibility-flip-expected.txt: Copied from LayoutTests/platform/ios-simulator/compositing/backing/backface-visibility-flip-expected.txt.
[...]

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@177052 268f45cc-cd09-0410-ab3c-d52691b4dbfc