Chart2Music help menu keybindings are incorrect for mac

[marthacryan]

For #6680, when the user presses "h", a help menu appears to show the different keybindings to navigate the chart. These keybindings are incorrect on mac (presumably they're correct for windows?)

[marthacryan]

To solve this, we're looking into this chart2music configuration: https://www.chart2music.com/docs/API/Config/#options

[marthacryan]

There is now an issue open in the chart2music repo: julianna-langston/chart2music#565