fix: --context value is not auto completed

[jooola]

TL;DR

hcloud config get token --allow-sensitive --context <tab><tab> does not autocomplete with the context name, but with filenames.

Expected behavior

The auto-completion should propose context names.

Observed behavior

The auto-completion is proposing filenames.

Minimal working example

hcloud config get token --allow-sensitive --context <tab>

Log output

No response

Additional information

[phm07]

Right now we don't have support for option auto-completing. We would have to add that first.