Fix for Anki >=2.1.28

[newageoflight]

Description

Allows Cloze Overlapper for Anki 2.1 to work on versions >=2.1.28. All credits for the fix go to @phu54321: https://www.reddit.com/r/Anki/comments/jlj1yy/fixing_cloze_overlapper_for_2128/

Checklist:

Please replace the space inside the brackets with an x and fill out the ellipses if the following items apply:

• I've read and understood the contribution guidelines
• I've tested my changes against at least one of the following Anki builds:
  • Latest standard Anki 2.1 binary build [required for Anki-compatible 2.1 add-ons]
  • Latest alternative Anki 2.1 binary build
  • Latest Anki 2.0 binary build [required for Anki 2.0-compatible add-ons]
• I've tested my changes on at least one of the following platforms:
  • Linux, version:
  • Windows, version: 10, build 2004
  • macOS, version:
• My changes potentially affect non-desktop platforms, of which I've tested:
  • AnkiMobile, version:
  • AnkiDroid, version:
  • AnkiWeb

[phu54321]

1. This PR has a bunch of commit. I recommend creating a novel branch containing only a fix, and not the other things
2. Glu has already fixed the issue in his development branch. (source) It's not just being released to public.

[newageoflight]

Noted. Will close and redo as appropriate.