Get rid of NUL character in PS1

The first grep in the original script will return "binary file matches" if there are NUL characters in PS1, e.g, emojis.
The added line gets rid of NUL characters.

st-copyout

@@ -6,6 +6,7 @@
 tmpfile=$(mktemp /tmp/st-cmd-output.XXXXXX)
 trap 'rm "$tmpfile"' 0 1 15
 sed -n "w $tmpfile"
+sed -i 's/\x0//g' "$tmpfile"
 ps1="$(grep "\S" "$tmpfile" | tail -n 1 | sed 's/^\s*//' | cut -d' ' -f1)"
 chosen="$(grep -F "$ps1" "$tmpfile" | sed '$ d' | tac | dmenu -p "Copy which command's output?" -i -l 10 | sed 's/[^^]/[&]/g; s/\^/\\^/g')"
 eps1="$(echo "$ps1" | sed 's/[^^]/[&]/g; s/\^/\\^/g')"