Canvas capture stream to peerConnection incorrect behaviour

The failing test is available at https://webrtc.github.io/test-pages/src/canvas-capture/

Expected result is (Firefox 107.0 Ubuntu 22.04):

Actual result (on Windows, built from https://gitlab.torproject.org/msimonelli/tor-browser/-/tree/bug-41459) is:

TOOD: build https://gitlab.torproject.org/msimonelli/tor-browser/-/tree/bug-41459 and test other platforms, which should hopefully work