Fixed dark background to fieldsets and right border

[Godmartinz]

Description

Fixes the fieldset table background color and right border.

Before:

After:

These changes are applied to all dark themes.

Fixes #[sc-27326]

Type of change

Please delete options that are not relevant.

• [ x] 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 not work as expected)
• This change requires a documentation update

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 any relevant details for your test configuration

• Test A
• Test B

Test Configuration:

• PHP version:
• MySQL version
• Webserver version
• OS version

Checklist:

• I have read the Contributing documentation available here: https://snipe-it.readme.io/docs/contributing-overview
• I have formatted this PR according to the project guidelines: https://snipe-it.readme.io/docs/contributing-overview#pull-request-guidelines
• My code follows the style guidelines of this project
• 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
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[what-the-diff]

PR Summary

• Updated Styling Property
  The previous styling property border-left has been updated to a new property border-inline in the overrides.less file. This change enhances the flexibility of borders specification in our layout, allowing it to adapt better to different writing directions, hence improving the overall user interface experience.

• Introduced New Style Rules
  A new set of style rules has been introduced for the class #sort tr.cansort across multiple skin files including skin-black-dark.less, skin-blue-dark.less, skin-green-dark.less, skin-orange-dark.less, skin-purple-dark.less, skin-red-dark.less, and skin-yellow-dark.less. These rules focus on specifying background-color and color parameters. This update intends to bring a more consistent and visually appealing experience to our users across all the different skins available.