Remove duplicated HEX and OCT digit constants

[tadeubas]

What is this PR for?

Remove duplicated HEX and OCT digit constants (were moved to src/krux/pages/mnemonic_loader.py)

Changes made to:

• Code
• Tests
• Docs
• CHANGELOG

Did you build the code and tested on device?

• Yes, build and tested on

What is the purpose of this pull request?

• Bug fix
• New feature
• Docs update
• Other

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.31%. Comparing base (94760c5) to head (791868d).
⚠️ Report is 6 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #841      +/-   ##
===========================================
- Coverage    97.31%   97.31%   -0.01%     
===========================================
  Files           83       83              
  Lines        10573    10571       -2     
===========================================
- Hits         10289    10287       -2     
  Misses         284      284              

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[odudex]

Thank you!