When the argument is a file with path provided, show the relative path of the file

[ayushpoddar]

Description

In order to demonstrate what this PR does, I am displaying the difference in the output of the command colorls exe/colorls (which is a file) before and after this PR

Before this PR

After this PR

Comment

This PR takes this gem one step closer to the behaviour of the in-built ls command.

Details

• Relevant Issues : #524
• Relevant PRs : (none)
• Type of change :
  • [ ] New feature
  • [x] Bug fix for existing feature
  • [ ] Code quality improvement
  • [ ] Addition or Improvement of tests
  • [ ] Addition or Improvement of documentation

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.08 :tada:

Comparison is base (d1e28ed) 92.04% compared to head (414820b) 92.13%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #594 +/- ## ========================================== + Coverage 92.04% 92.13% +0.08% ========================================== Files 8 8 Lines 616 623 +7 ========================================== + Hits 567 574 +7 Misses 49 49 ``` | [Impacted Files](https://codecov.io/gh/athityakumar/colorls/pull/594?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [lib/colorls/fileinfo.rb](https://codecov.io/gh/athityakumar/colorls/pull/594?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-bGliL2NvbG9ybHMvZmlsZWluZm8ucmI=) | `90.19% <100.00%> (+1.55%)` | :arrow_up: | | [lib/colorls/flags.rb](https://codecov.io/gh/athityakumar/colorls/pull/594?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-bGliL2NvbG9ybHMvZmxhZ3MucmI=) | `89.59% <100.00%> (ø)` | |

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[avdv]

Thank you!