Accidental display in **mens

[craigsapp]

Accidentals within the key signature are showing on notes, but they should be hidden (unless explicitly shown).

Example:

The flat in front of B3 should not be there.

Test data:

**mens
*clefC3
*k[b-]
=
Sc
SB-
Sc
=
*-

[craigsapp]

Implemented in commit https://github.com/rism-digital/verovio/commit/ee2f51d67f38712ad298ee62e1f266c0198c7c2e

Now renders as: