other: Add the config path to the error message if unable to create config

[CosmicHorrorDev]

Description

A description of the change, what it does, and why it was made. If relevant (such as any change that modifies the UI), please provide screenshots of the changes:

Adds the resolved config path to the error message returned from failed to get or create the config file. E.g.

$ rm -rf ~/.config/bottom

$ chmod -w ~/.config

$ c r
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.09s
     Running `target/debug/btm`
Error: Unable to parse or create the config file at: /home/cosmic/.config/bottom/bottom.toml

Caused by:
    Error with the config file or the arguments: Permission denied (os error 13)

The motivation was that I was showing btm to a friend, but it was failing to run on their computer due to some cursed issues on their home folder: however, the specific path that is causing an issue is missing from the message making things harder to debug

Issue

If applicable, what issue does this address?

I couldn't find any existing relevant issues

Testing

If relevant, please state how this was tested. All changes must be tested to work:

Tested using the commands listed in the description (which does wipe your existing bottom folder)

If this is a code change, please also indicate which platforms were tested:

• Windows
• macOS
• Linux

Checklist

If relevant, ensure the following have been met:

• Areas your change affects have been linted using rustfmt (cargo fmt)
• The change has been tested and doesn't appear to cause any unintended breakage
• Documentation has been added/updated if needed (README.md, help menu, doc pages, etc.) skipped
• The pull request passes the provided CI pipeline only fails from coverage which I' m counting as a pass
• There are no merge conflicts
• If relevant, new tests were added (don't worry too much about coverage) skipped

[ClementTsang]

Thanks! Seems like a good improvement to me.

[ClementTsang]

@all-contributors please add @CosmicHorrorDev for code.

[allcontributors]

@ClementTsang

I've put up a pull request to add @CosmicHorrorDev! 🎉