CLUE Hand Wash Timer: Update for CP7

[lesamouraipourpre]

Remove max_size usage with displayio.Group
Remove max_glyphs usage with Display_Text Label
Update OnDiskBitmap usage with filename string for CP7

Ref: #1603

Learn Guide: https://learn.adafruit.com/no-touch-hand-wash-timer-for-cpx-and-clue
Changes Needed:
Page: https://learn.adafruit.com/no-touch-hand-wash-timer-for-cpx-and-clue/clue-hand-wash-timer
Sections:

• Display and Images: Update the OnDiskBitmap code

[FoamyGuy]

These changes look good to me. Tested successfully with CLUE CircuitPython 6.3.0 and 7.0.0 alpha3

The guide page linked uses github code embed so when this gets merged it will get updated automatically.

[FoamyGuy]

I see there is a section that you mentioned on the learn guide that is not a github embed.

I think we can leave it alone though, it's got the updated code that works for both new and older versions already. The only thing missing is the comment. But I think that is okay in this case since this section is explaining the code at a higher level. I think it's okay to omit the comment to keep those snippets more concise.

[TheKitty]

Guide changes made