Fix zsh autocomplete error.
Fix zsh autocomplete error.

All that was missing was "--".

Resolves:LE-5580
Change-Id: I05b4cc2019ebb4ecec0bb663b0b19a881af690b6

legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af