[BUGFIX] Charting Editor Sustain Trails (2 bugs)

[gamerbross]

This pull request fixes two bugs:

Note Sustain Trails getting cut/inverted when is downscroll enabled

Before	After

Incorrect Sustain Trails origin note (based on ghost note)

Before	After

Hope this gets added soon =D

[charlesisfeline]

i got one of these problems before, tysm

[amyspark-ng]

the Incorrect Sustain Trails origin note has actually been bothering me for a while, this is cool :)

[EliteMasterEric]

Approving because this does fix stuff, but currently Downscroll on chart editor doesn't fully work as intended (It's supposed to flip the note grid vertically and scroll upwards, I never properly implemented that which is why it's grayed out in the editor).

[gamerbross]

Options downscroll and charting downscroll are separated things, the bug is related to options downscroll, a different check should be in ChartEditorHoldNoteSprite for charting downscroll. Should anyways revert it so at least the other fix gets merged?

[EliteMasterEric]

Options downscroll and charting downscroll are separated things, the bug is related to options downscroll, a different check should be in ChartEditorHoldNoteSprite for charting downscroll. Should anyways revert it so at least the other fix gets merged?

Ah that explains it! We can leave flipY = true in place for now until I get around to making downscroll work.