Add the ability to remove the key signature for the horn part.

Problem to be solved

In MuseScore 3, there was a feature that allowed removing the key signature for the horn part so that no accidentals appeared in the key signature, and all accidentals were written only next to the notes. In MuseScore 4, I cannot do this anymore—when I try to remove it, the key signature changes for all instruments in the score. This is a serious issue, because in modern notation horns are often written without key signatures, with accidentals shown only next to notes. However, it seems that MuseScore does not support this anymore. When I tried to remove the key signature through the staff/part properties, the function did not work.

Add the ability to remove the key signature for the horn part.

Prior art

In the Finale program, it is possible to remove the key signature for the horn part without any issues like this.

Additional context

No response

Checklist

• This request follows the guidelines for reporting issues
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