Author: Benjamin Drung
Author Date: 2023-09-19 12:10:03 UTC

bash-completion: Do not use ls in completion

Users might set aliases for ls breaking the bash completion:

```
alias ls='ls -N --color=yes --time-style=long-iso'
apport-bug <tab>
```

Shellcheck also complains about it:

```
shellcheck -S error -s bash data/bash-completion/{apport-bug,apport-collect,apport-unpack}

In data/bash-completion/apport-bug line 8:
        for FILE in $(ls /usr/share/apport/symptoms); do
                    ^-- SC2045 (error): Iterating over ls output is fragile. Use globs.

For more information:
  https://www.shellcheck.net/wiki/SC2045 -- Iterating over ls output is fragi...
```

Ubuntu-Bug: https://launchpad.net/bugs/1850804
Signed-off-by: Benjamin Drung <benjamin.drung@canonical.com>