fix: icon hl width for various pickers

[jamestrew]

Description

Fix the highlight group width for devicons for various pickers' entry display.
Currently, certain entry makers fail to compensate for the icon widths not equal to 3.
Closes #2445

Effects pickers using gen_from_file and gen_from_vimgrep make entries.

• find_files
• git_files
• oldfiles
• live_grep
• grep_string

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list relevant details about your configuration

• verify overwriting devicon icons and colors (using config from issue Icon/color overrides in nvim-web-devicons are not respected #2445) work with the above mentioned pickers
• verify that not overwriting icons and colors still work with the above mentioned pickers

Configuration:

• Neovim version (nvim --version): NVIM v0.9.0-dev-1305+g83bfd94d1
• Operating system and version: Linux archlinux 6.2.8-arch1-1

Checklist:

• My code follows the style guidelines of this project (stylua)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (lua annotations)

[Conni2461]

thanks :)

[Conni2461]

also thanks for maintaining issues, while i was away :) I'll try to spend more time on telescope in the next couple of days, fingers crossed