cmake: fix grep in setupHook

This produced a warning:

> grep: Invalid range end

In a [], - has to come last.

Reported-by: Daniël de Kok <[e-mail]>
Fixes: 75fdc1ced6c

pkgs/development/tools/build-managers/cmake/setup-hook.sh

···
         fi
         # The argument sometimes contains garbage or variable interpolation.
         # When that is the case, let’s fall back to the derivation name.
-        if [[ -z "$shareDocName" ]] || echo "$shareDocName" | grep -q '[^a-zA-Z0-9_-+]'; then
+        if [[ -z "$shareDocName" ]] || echo "$shareDocName" | grep -q '[^a-zA-Z0-9_+-]'; then
             if [[ -n "${pname-}" ]]; then
                 shareDocName="$pname"
             else