fix switch background color when none defined

[NuktukDev]

#5756

Bug report
The switch background color was broken 4 days ago.

What I did
I used the switch.

What I expected to happen
It would take the default background color defined by tabler.

What happened
It shows a blank color.

What I've already tried to fix it
I fixed it already.

Is it a bug in the latest version of Backpack?
Yes.

After I run composer update backpack/crud the bug... is it still there?
Yes.

Backpack, Laravel, PHP, DB version
Latest backpack, laravel 10, php 8.

When I run php artisan backpack:version the output is:

backpack/basset: 1.3.6
backpack/crud: 6.7.50
backpack/generators: v4.0.7
backpack/medialibrary-uploaders: 1.2.1
backpack/pro: 2.2.32
backpack/theme-tabler: 1.2.17
Additional Information
There is a class switch-{{ $field['color'] }} that doesn't make sense to me, I removed it.

Here's some more info that could be helpful in reproducing or debugging:

Environment details (e.g., operating system, web server, browser): ??
Relevant error logs or screenshots (if any): ??
Note: Issues that cannot be reproduced or lack necessary details to diagnose could be closed.

[welcome]

BOOM! Your first PR with us, thank you so much! Someone will take a look at it shortly.

Please keep in mind that:

• if this constitutes a breaking change, it might take quite a while for this to get merged; we try to emulate the Laravel release cycle as much as possible, so developers can upgrade both software once; this means a new big release every ~6 months;
• even if it's a non-breaking change, it might take a few days/weeks for the PR to get merged; unless it's a no-brainer, we like to have some community feedback on new features, before we merge them; this leads to higher-quality code, in the end; we learnt this the hard way :-)
• not all PRs get merged; sometimes we just have to hold out new features, to keep the packages lean; sometimes we don't include features that only apply to niche use cases;
• we're not perfect; if you think we're wrong, call us out on it; but in a kind way :-) we all make mistakes, best we learn from them and build better software together;

Thank you!

--
Justin Case
The Backpack Robot

[NuktukDev]

This corresponds to this issue:
#5756

I'm not sure how to do the PR and an issue report properly.

[pxpm]

Thanks for the PR @NuktukDev, much appreciated. Unfortunately we can't merge it as is.

We have already created and merged another PR to fix this issue. I will tag a new CRUD version with the fixes later today 🙏

Cheers