Error when combining --gs and --tree

### Description

I believe this is a new issue; I could not find a dupe.

- Relevant Issues : (none)
- Relevant PRs : (none)
- Type of issue :
- [ ] Installation
- [ ] Font-related
- [ ] Feature request
- [x] Bug in existing feature
- [ ] Developer mode : Code quality / Tests / Documentation

There seems to be an issue when combining `--gs` and `--tree`, e.g.:
```
$ colorls --tree --gs -d -a .oh-my-zsh/custom
Found existing alias for "colorls --tree". You should use: "tree"

└── A?  plugins/
│ └────.oh-my-zsh/custom: No such file or directory @ rb_dir_s_empty_p - /home/myself/.oh-my-zsh/custom/somecustompluginfolder
```

Note the wrong path causing the error, should be: `/home/myself/.oh-my-zsh/custom/plugins/somecustompluginfolder`.

Works without `--gs`:
```
$ colorls --tree -d -a .oh-my-zsh/custom

└──  plugins/
│ └────  somecustompluginfolder/
│ └────  colorls/
│ └────  git/
│ └────  you-should-use/
│ │ └────  .circleci/
│ │ └────  img/
│ │ └────  tests/

```

Start by reproducing the reported command, `colorls --tree --gs -d -a .oh-my-zsh/custom`, and compare it with the working command without `--gs`. Trace the CLI handling for `--gs` and `--tree` to find where the nested path is formed. Done means the combined options resolve `/home/myself/.oh-my-zsh/custom/plugins/somecustompluginfolder` correctly without the path error.

Written by the indexing model from the issue text.