Fix multiple targets failing to be parsed after a major clap update (fixes #325)

[VolodiaPG]

This fixes #325 by adding a missing argument to the decorator of the targets cli arg.

[sedlund]

build args are still broken with this

nix run "github:VolodiaPG/deploy-rs?rev=2edaf49" -- --targets .#wsl.system -- -Lv

error: the argument '--targets <TARGETS>...' cannot be used with '[TARGET]'

Usage: deploy --targets <TARGETS>... [TARGET] [EXTRA_BUILD_ARGS]...

thanks for looking at it