changed access key so they are all unique

[Boumtchack]

Link to issue number:

Closes #20500

Summary of the issue:

Access keys in the magnifier settings was not unique

Description of user facing changes:

All access keys are now unique

Description of developer facing changes:

True center mode from T to R
Tracking mode from M to T

Description of development approach:

Testing strategy:

Known issues with pull request:

Code Review Checklist:

• Documentation:
  • Change log entry
  • User Documentation
  • Developer / Technical Documentation
  • Context sensitive help for GUI changes
• Testing:
  • Unit tests
  • System (end to end) tests
  • Manual testing
• UX of all users considered:
  • Speech
  • Braille
  • Low Vision
  • Different web browsers
  • Localization in other languages / culture than English
• API is compatible with existing add-ons.
• Security precautions taken.

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