Update test expectations.

* Tag some more tests as failing or passing. Still a lot to do...
Fix warning.

* This function will never be called, but it's tagged noreturn, so make
it not return.
Use B_OP_COPY to draw video frames.

B_OP_OVER is not what we want, there is no use in transparent videos.
Fix warning.

* 1 window is probably the right count, anyway.
Avoid downloading hpkg files.

* Force the correct MIME type so Web+ downloads them instead.
* Should fix #10617.