Clean b* themes

[BarbUk]

Description

Clean and lint b* themes

Motivation and Context

#1696

How Has This Been Tested?

Tested all themes before and after changes.
1 error was detected, resulting in an other PR: #1789

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• If my change requires a change to the documentation, I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• If I have added a new file, I also added it to clean_files.txt and formatted it using lint_clean_files.sh.
• I have added tests to cover my changes, and all the new and existing tests pass.

[NoahGorny]

Works great!
Thank you @BarbUk !!
I left a comment, that require you to change some things back to the way they were, but otherwise it looks really good 😄

[BarbUk]

@cornfeedhobo made a good argument in #1791 (comment), we should not change the code for COMPREPLY array when we know that the string used is safe.

The warning is now disabled only for the appropriate lines.

[NoahGorny]

LGTM, I will let other folks chime in if they want, but well done @BarbUk !
Thank you for helping us make a big step into making this project a cleaner place 😄

[BarbUk]

Thank you for helping us make a big step into making this project a cleaner place

I use bash-it since ~2011, it's great to give a little time to the project :)