Assure that Lighttpd conf-enabled symlink is removed

`/etc/lighttpd/conf-enabled` usually contains symlinks to the actual files in `/etc/lighttpd/conf-available`, at least `lighty-enable-mod` does exactly this. If `/etc/lighttpd/conf-available/15-pihole-admin.conf` is removed first, `/etc/lighttpd/conf-enabled/15-pihole-admin.conf` hence points to nowhere, which makes the `-f` check return false. The orphaned symlink is hence not removed, if `lighty-disable-mod` is not available.

This PR changes the order, to remove the symlink first, and to be failsafe also if it is orphaned already, and the actual config afterwards.

Signed-off-by: MichaIng <micha@dietpi.com>

automated install/basic-install.sh

@@ -1208,12 +1208,12 @@ remove_old_pihole_lighttpd_configs() {
         lighty-disable-mod pihole-admin >/dev/null || true
     fi
 
-    if [[ -f "${confavailable}" ]]; then
-        rm "${confavailable}"
+    if [[ -f "${confenabled}" || -L "${confenabled}" ]]; then
+        rm "${confenabled}"
     fi
 
-    if [[ -f "${confenabled}" ]]; then
-        rm "${confenabled}"
+    if [[ -f "${confavailable}" ]]; then
+        rm "${confavailable}"
     fi
 }