Fix bad substitution in OpenVPN verbosity parameter: ${$log_level} → ${log_level}

Agent-Logs-Url: https://github.com/alexbelgium/hassio-addons/sessions/d37f963b-d7de-45b8-885a-ae3ecf34eb80

Co-authored-by: alexbelgium <44178713+alexbelgium@users.noreply.github.com>

qbittorrent/rootfs/usr/local/sbin/vpn

@@ -514,7 +514,7 @@ _openvpn_up() {
         --config "${config["ConfigFile"]}" \
         --client \
         --daemon \
-        --verb ${verbosity[${$log_level}]} \
+        --verb ${verbosity[${log_level}]} \
         --log "/proc/1/fd/1" \
         --script-security 2 \
         --auth-user-pass "${OPENVPN_STATE_DIR}/credentials.conf" \