Feat: Add TRUE and FALSE as search terms

[Serralq]

Summary

This was to meet this feature request: https://github.com/TagStudioDev/TagStudio/issues/1142 To allow for TRUE and FALSE as keywords in the search bar.

Tasks Completed

• Platforms Tested:
  • [ ] Windows x86
  • [ ] Windows ARM
  • [ ] macOS x86
  • [ ] macOS ARM
  • [X] Linux x86
  • [ ] Linux ARM
• Tested For:
  • [X] Basic functionality
  • [ ] PyInstaller executable

[TrigamDev]

__is_next_false() appears to incorrectly be an exact duplicate of __is_next_true(), checking if the next token is "TRUE"