Fix #27058: Mute settings are broken in parts whose instruments were deleted and then restored with Undo#29237

mathesoncalum merged 2 commits intomusescore:mastermusescore/MuseScore:masterfrom

RomanPudashkin:restore_solo_mute_stateRomanPudashkin/MuseScore:restore_solo_mute_stateCopy head branch name to clipboard