Consistency to all other Alpine Menus (#1230)

that was the only script with the "Exit-Script" for the Alpine ones.
Now it is consistent

ct/alpine-grafana.sh

@@ -55,7 +55,7 @@ function update_script() {
   LXCIP=$(ip a s dev eth0 | awk '/inet / {print $2}' | cut -d/ -f1)
   while true; do
     CHOICE=$(
-      whiptail --title "SUPPORT" --menu "Select option" --cancel-button Exit-Script 11 58 3 \
+      whiptail --title "SUPPORT" --menu "Select option" 11 58 3 \
         "1" "Check for Grafana Updates" \
         "2" "Allow 0.0.0.0 for listening" \
         "3" "Allow only ${LXCIP} for listening" 3>&2 2>&1 1>&3