Install pihole-FTL.conf template on fresh installation (#4496)

Signed-off-by: Christian König <ckoenig@posteo.de>

advanced/Templates/pihole-FTL.conf

@@ -0,0 +1,2 @@
+#; Pi-hole FTL config file
+#; Comments should start with #; to avoid issues with PHP and bash reading this file

automated install/basic-install.sh

@@ -1299,10 +1299,10 @@ installConfigs() {
     echo "${DNS_SERVERS}" > "${PI_HOLE_CONFIG_DIR}/dns-servers.conf"
     chmod 644 "${PI_HOLE_CONFIG_DIR}/dns-servers.conf"
 
-    # Install empty file if it does not exist
+    # Install template file if it does not exist
     if [[ ! -r "${PI_HOLE_CONFIG_DIR}/pihole-FTL.conf" ]]; then
         install -d -m 0755 ${PI_HOLE_CONFIG_DIR}
-        if ! install -o pihole -m 664 /dev/null "${PI_HOLE_CONFIG_DIR}/pihole-FTL.conf" &>/dev/null; then
+        if ! install -T -o pihole -m 664 "${PI_HOLE_LOCAL_REPO}/advanced/Templates/pihole-FTL.conf" "${PI_HOLE_CONFIG_DIR}/pihole-FTL.conf" &>/dev/null; then
             printf "  %bError: Unable to initialize configuration file %s/pihole-FTL.conf\\n" "${COL_LIGHT_RED}" "${PI_HOLE_CONFIG_DIR}"
             return 1
         fi