(WIP)
Seems to mitigate some conflicts when switching between `edgeclk` (with
seconds active) and `dtlaunch`. Sometimes the seconds redraw timeout of
`edgeclk` would draw over `dtlaunch`.
`undefined` handlers are created when we [remove listeners] part-way
through the array. This fixes `backswipe` for all firmwares, but
leaves the door open for a potential firmware change.
[remove listeners]: 0f16231a43/src/jswrap_object.c (L1035-L1035)