[feature request] make --nth independent of --with-nth

[cwrau]

Checklist

• I have read through the manual page (man fzf)
• I have searched through the existing issues
• For bug reports, I have checked if the bug is reproducible in the latest version of fzf

Output of fzf --version

0.59.0 (bbe1721)

OS

• Linux
• macOS
• Windows
• Etc.

Shell

• bash
• zsh
• fish

Problem / Steps to reproduce

cat <<EOF | fzf -d: --with-nth=2 --nth=1..2
col1:col2
EOF

Search for col1, which returns no result

It would be great to be able to search "hidden" fields as well.

I've seen #2432, but that trailed off into another direction and was "closed" by a fix for ellipsis.