Rebase WebAudio LayoutTests and fix TestExpectations from nix.

Rebase some LayoutTests after changes at [1] and [2].
Skip failure LayoutTests of WebAudio.

[1] https://bugs.webkit.org/show_bug.cgi?id=105174
[2] https://bugs.webkit.org/show_bug.cgi?id=100885

Reviewed by: Lauro Neto