Note recording broken for custom scale

[evguu]

Custom scale requires special handling, which was forgotten in some places.
Examples:

abyssbox-source/editor/RecordingSetupPrompt.ts

Line 155 in 1b84f6f

const scale: ReadonlyArray<boolean> = Config.scales[this._doc.song.scale].flags;

Missing handling causes incorrect note recording prompt layout for custom scale.

abyssbox-source/editor/KeyboardLayout.ts

Line 28 in 1b84f6f

const scaleFlags: ReadonlyArray<boolean> = Config.scales[doc.song.scale].flags;

Missing handling causes note recording to always use the default setup of the scale, ignoring what the user has set.

[choptop84]

Both of these files are nearly identical to UltraBox, so either the issue is found elsewhere or UltraBox also has this issue