Circuit_Playground_Sailor_Moon_Star_Locket: Update for CP7

[lesamouraipourpre]

Remove max_size usage from displayio.Group

Ref: #1603

Changes are need in the Learn Guide: https://learn.adafruit.com/sailor-moon-star-locket/overview

Page: https://learn.adafruit.com/sailor-moon-star-locket/circuitpython-code-walkthrough
Section: Graphics: Groups
Asset Link: https://learn.adafruit.com/pages/21957/elements/3086998/download
New version:

#  adding the two jewel circle elements to a group
jewel_splash = displayio.Group()
jewel_splash.append(jewel_outline)
jewel_splash.append(jewel)

[jepler]

Looks fine, no testing performed.

It's fine & good to run black as you modify these files, but for reviewers it can be helpful if you create TWO commits, one in which you run black (the reviewer can assume that no behavior was changed in that commit) and a second one in which you make the actual change. This way, in github the reviewer can use the "Changes from [specific commit]" dropdown to focus in on the real changes.