Update audio/musescore to latest upstream release, 3.4.1

3.4 was a features release, followed quick by a bugfix 3.4.1:
https://musescore.org/en/handbook/developers-handbook/release-notes/release-notes-musescore-3x/release-notes-musescore-34x-2
https://musescore.org/en/handbook/developers-handbook/release-notes/release-notes-musescore-3x/release-notes-musescore-34x-3

The patches change more than usual, since the bizzarre copy-webengine
CMake code moved to another directory.

Reported by: portscout