Fix an apparent incompatibility between enum class ...: unsigned char and QML enums

Backport of musescore#7521 resp. duplicate of musescore#7520, part 2

Author: Jojo-Schmitz

libmscore/note.h

@@ -42,7 +42,7 @@ class NoteDot;
 class Spanner;
 class StaffType;
 class NoteEditData;
-enum class AccidentalType : unsigned char;
+enum class AccidentalType;
 
 static const int MAX_DOTS = 4;
 

libmscore/types.h

@@ -150,7 +150,7 @@ enum class ElementType {
 //---------------------------------------------------------
 // NOTE: keep this in sync with with accList array in accidentals.cpp
 
-enum class AccidentalType : unsigned char {
+enum class AccidentalType {
       ///.\{
       NONE,
       FLAT,