Remove the email function

It was removed from pi-hole in 5.12 by this PR https://github.com/pi-hole/pi-hole/pull/4870

Signed-off-by: LaboDJ <2527836+labodj@users.noreply.github.com>

src/s6/debian-root/usr/local/bin/bash_functions.sh

@@ -524,11 +524,3 @@ setup_web_layout() {
       fi
   fi
 }
-
-setup_admin_email() {
-  local EMAIL="${ADMIN_EMAIL}"
-  # check if var is empty
-  if [[ "$EMAIL" != "" ]] ; then
-      pihole -a -e "$EMAIL"
-  fi
-}