Do not ask admin password just for help documentation

It is not a good idea to ask for an admin password just to get the
command documentation.
"pihole -h" should return the arguments documentation with no need to
enter a password.

Without the patch I get:
$ ./pihole -h
Password:

It is easy to reproduce by invalidating the sudo password using
"sudo -k" before running pihole again.

Signed-off-by: Ludovic Rousseau <ludovic.rousseau@free.fr>

pihole

@@ -23,17 +23,6 @@ source "${colfile}"
 
 resolver="pihole-FTL"
 
-# Must be root to use this tool
-if [[ ! $EUID -eq 0 ]];then
-  if [[ -x "$(command -v sudo)" ]]; then
-    exec sudo bash "$0" "$@"
-    exit $?
-  else
-    echo -e "  ${CROSS} sudo is needed to run pihole commands.  Please run this script as root or install sudo."
-    exit 1
-  fi
-fi
-
 webpageFunc() {
   source "${PI_HOLE_SCRIPT_DIR}/webpage.sh"
   main "$@"
@@ -430,6 +419,21 @@ if [[ $# = 0 ]]; then
   helpFunc
 fi
 
+case "${1}" in
+  "-h" | "help" | "--help"      ) helpFunc;;
+esac
+
+# Must be root to use this tool
+if [[ ! $EUID -eq 0 ]];then
+  if [[ -x "$(command -v sudo)" ]]; then
+    exec sudo bash "$0" "$@"
+    exit $?
+  else
+    echo -e "  ${CROSS} sudo is needed to run pihole commands.  Please run this script as root or install sudo."
+    exit 1
+  fi
+fi
+
 # Handle redirecting to specific functions based on arguments
 case "${1}" in
   "-w" | "whitelist"            ) listFunc "$@";;