Simplify nested if statements.

Co-authored-by: yubiuser <ckoenig@posteo.de>
Signed-off-by: Adam Warner <me@adamwarner.co.uk>

automated install/basic-install.sh

@@ -1008,27 +1008,25 @@ remove_old_pihole_lighttpd_configs() {
     local confenabled="/etc/lighttpd/conf-enabled/15-pihole-admin.conf"
 
 
-    if [[ -d "/etc/lighttpd/conf.d" ]]; then
+    if [[ -f "${lighttpdConfig}" ]]; then
         sed -i '/include "\/etc\/lighttpd\/conf.d\/pihole-admin.conf"/d' "${lighttpdConfig}"
+    fi
 
-        if [[ -f "${condfd}" ]]; then
-            rm "${condfd}"
-        fi
-
+    if [[ -f "${condfd}" ]]; then
+        rm "${condfd}"
+    fi
 
-    elif [[ -d "/etc/lighttpd/conf-available" ]]; then
-        if is_command lighty-disable-mod ; then
-            lighty-disable-mod pihole-admin > /dev/null || true
-        fi
+    if is_command lighty-disable-mod ; then
+        lighty-disable-mod pihole-admin > /dev/null || true
+    fi
 
-        if [[ -f "${confavailable}" ]]; then
-            rm "${confavailable}"
-        fi
+    if [[ -f "${confavailable}" ]]; then
+        rm "${confavailable}"
+    fi
 
-        if [[ -f "${confenabled}" ]]; then
-            rm "${confenabled}"
-        fi
-     fi
+    if [[ -f "${confenabled}" ]]; then
+        rm "${confenabled}"
+    fi
 }
 
 # Clean an existing installation to prepare for upgrade/reinstall