This fixes a bug where certain tab completions would be met with lots
of sed errors.
It is also faster since it uses 1 less sed process.
Additionally it will also show 'no matches' if there are no
matches found for a command completion, instead of showing
a suggestion to add 1st level commands on.
Before: equo X (no cmds left to add)
zsh suggests install, query, remove etc.
Now it will properly say there are not more suggestions
for most of the $1 terms
83ea0e56cf