uninstall: Skip in-use runtime check with --unused

confirm_runtime_removal() doesn't know about autoprune-unless
extensions, so it prompts unnecessarily when they're removed by
`flatpak uninstall --unused`. To avoid this, we can simply skip it and
trust flatpak_dir_list_unused_refs().

Closes #5712
Helps #2718
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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f