De-duplicate restart_nginx in post-delete hook

plugins/nginx-vhosts/post-delete

@@ -1,21 +1,5 @@
 #!/usr/bin/env bash
 set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_AVAILABLE_PATH/proxy/functions"
+source "$PLUGIN_AVAILABLE_PATH/nginx-vhosts/functions"
 
-case "$DOKKU_DISTRO" in
-  debian)
-    sudo /usr/sbin/invoke-rc.d nginx reload > /dev/null
-    ;;
-
-  ubuntu)
-    sudo /etc/init.d/nginx reload > /dev/null
-    ;;
-
-  opensuse)
-    sudo /sbin/service nginx reload > /dev/null
-    ;;
-
-  arch)
-    sudo /usr/bin/systemctl reload nginx
-    ;;
-esac
+restart_nginx "$@"