solves issue #555 (Update keyboard.py)

[fedebuyito]

Growning "del" button size property (from 2 to 3) solves navigation issue ("6th dice" -> "del").

solves issue #555

Description

Describe the change simply. Provide a reason for the change.

Include screenshots of any new or modified screens (or at least explain why they were omitted)

This pull request is categorized as a:

• New feature
• Bug fix
• Code refactor
• Documentation
• Other

Checklist

• I’ve run pytest and made sure all unit tests pass before sumbitting the PR

If you modified or added functionality/workflow, did you add new unit tests?

• No, I’m a fool
• Yes
• N/A

I have tested this PR on the following platforms/os:

• Raspberry Pi OS Manual Build
• SeedSigner OS on a Pi0/Pi0W board
• Other

Note: Keep your changes limited in scope; if you uncover other issues or improvements along the way, ideally submit those as a separate PR. The more complicated the PR the harder to review, test, and merge.

[newtonick]

This PR might fix the dice role entry screen but breaks other screens that use the delete keyboard. When testing the passphrase entry keyboard screen, it throws this exception: UnhandledExceptionView({'error': ['Exception', 'keyboard.py, 204, in __init__', ' charset will not fit in a 4x6 layout | additional_keys']}) | clear_history: True

This exception can also be seen when running the screenshot generator (pytest tests/screenshot_generator/generator.py)

FAILED tests/screenshot_generator/generator.py::test_generate_screenshots - Exception: charset will not fit in a 4x6 layout | additional_keys: [{'code': 'SPACE', 'letter': 'space', 'font': 'compact', 'size': 2}, {'code': 'CURSOR_LEFT', 'letter': '<', 'font': 'regular', 'size': 1}, {'...

[newtonick]

Other solution options are being discussed on #555

[fedebuyito]

With further suggestions of @kdmukai I could to fix issues and failed test #598 . #555