Update launcher.py for infinite scrolling

[jsh97]

changed the logic, so that you start again on the top page if you scroll further down on the last page.

[Gadgetoid]

You should be able to use:

  if pin == badger2040.BUTTON_UP:
        state["page"] = (state["page"] - 1) % MAX_PAGE
        render()
    if pin == badger2040.BUTTON_DOWN:
        state["page"] = (state["page"] + 1) % MAX_PAGE
        render()

Which will keep state["page"] between 0 and MAX_PAGE, since:

>>> math.fmod(-1, 2)
-1.0
>>> -1 % 2
1

(because Python is weird, yay)

Your approach works because Python's list support negative indices and ranges:

>>> list("abcdef")[-1]
f

But having -1 in the saved launcher state would be a little weird!