basic_install: There is no pihole group, remove it

Only a user has been created beforehand. Only some distributions create
a group with the same name based on their configuration. We cannot
assume this is always the default.

Signed-off-by: Andreas Schneider <asn@cryptomilk.org>

automated install/basic-install.sh

@@ -1364,7 +1364,7 @@ installConfigs() {
     # Install empty file if it does not exist
     if [[ ! -r "${PI_HOLE_CONFIG_DIR}/pihole-FTL.conf" ]]; then
         install -d -m 0755 ${PI_HOLE_CONFIG_DIR}
-        if ! install -o pihole -g pihole -m 664 /dev/null "${PI_HOLE_CONFIG_DIR}/pihole-FTL.conf" &>/dev/null; then
+        if ! install -o pihole -m 664 /dev/null "${PI_HOLE_CONFIG_DIR}/pihole-FTL.conf" &>/dev/null; then
             printf "  %bError: Unable to initialize configuration file %s/pihole-FTL.conf\\n" "${COL_LIGHT_RED}" "${PI_HOLE_CONFIG_DIR}"
             return 1
         fi