Shellcheck for Test for $? -eq 0

Signed-off-by: Dan Schaper <dan.schaper@pi-hole.net>

automated install/basic-install.sh

@@ -1013,9 +1013,9 @@ update_dialogs() {
 
   UpdateCmd=$(whiptail --title "Existing Install Detected!" --menu "\n\nWe have detected an existing install.\n\nPlease choose from the following options: \n($strAdd)" ${r} ${c} 2 \
   "${opt1a}"  "${opt1b}" \
-  "${opt2a}"  "${opt2b}" 3>&2 2>&1 1>&3)
+  "${opt2a}"  "${opt2b}" 3>&2 2>&1 1>&3) || \
+  { echo "::: Cancel selected. Exiting"; exit 1; }
 
-  if [[ $? = 0 ]];then
   case ${UpdateCmd} in
     ${opt1a})
       echo "::: ${opt1a} option selected."
@@ -1026,10 +1026,6 @@ update_dialogs() {
       useUpdateVars=false
       ;;
     esac
-  else
-    echo "::: Cancel selected. Exiting..."
-    exit 1
-  fi
 }
 
 main() {