fix(Ornaments): Mordent and inverted mordent reversed (mordent with line), according to MusicXML definition (#866)

apparently the definitions of mordent and inverted mordent switched in the 19th century
from the original baroque definitions.
Since we interpret MusicXML, we'll use the MusicXML definitions,
where mordent has a line through.
(Vexflow is using the opposite, baroque definition)

src/MusicalScore/Graphical/VexFlow/VexFlowConverter.ts

@@ -494,7 +494,7 @@ export class VexFlowConverter {
                 break;
             }
             case OrnamentEnum.InvertedMordent: {
-                vfOrna = new Vex.Flow.Ornament("mordent_inverted");
+                vfOrna = new Vex.Flow.Ornament("mordent"); // Vexflow uses baroque, not MusicXML definition
                 vfOrna.setDelayed(false);
                 break;
             }
@@ -504,7 +504,7 @@ export class VexFlowConverter {
                 break;
             }
             case OrnamentEnum.Mordent: {
-                vfOrna = new Vex.Flow.Ornament("mordent");
+                vfOrna = new Vex.Flow.Ornament("mordent_inverted");
                 vfOrna.setDelayed(false);
                 break;
             }