fix: Correctly enter up directories

[lj3954]

Type of Change

• Bug fix
• Hotfix

Description

#490 introduced a regression where entering an up directory (..) results in an empty command executing, instead of entering the parent directory. This resolves the issue by including a check for whether the current selection is an up directory in addition to whether it's a standard directory.

Issues / other PRs related

• Resolves Pressing ENTER on .. shows a "Success" message #579

Checklist

• My code adheres to the coding and style guidelines of the project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• My changes generate no errors/warnings/merge conflicts.