Revert to process substitution for vg function
Revert to process substitution for vg function

This effectively cancels out the change to an async Grep with commit
7db4a75cbb814753feda9982eefb7521cd045781.

Since I intentionally start Vim with a grep to start off, there's really
nothing for me to do except wait for the grep to end, which means I
don't take advantage of async Greps anyway.

However, the extra layer of Vim's commandline (since I'm effectively
doing :Grep) means my greps suffer from nested quoting issues
(e.g. vim -q <(rg "foo bar") vs vim +'Grep "foo bar"').

igemnace/zsh-config