Fix restore for NODATE

I tested it in Virtualbox with my own live server backups and it seemed to restore fine like this. I'm not sure if the help/explanation is enough, feel free to add more, change wording, etc.

helper-scripts/backup_and_restore.sh

@@ -23,6 +23,10 @@ if [[ ${1} == "help" ]]; then
 
     NODATE: Allows you to omit the date stamped folder.
       example: NODATE=1 backup_and_restore.sh backup all
+      
+      IMPORTANT: If you'd like to restore a NODATE backup, you have to
+      use NODATE=1 for restoring as well! Otherwise, Mailcow will only
+      look for timestamped folders, which you will not have.
 
   You can combine the variables as well.
     example: THREADS=4 NODATE=1 backup_and_restore.sh backup all
@@ -367,10 +371,20 @@ if [[ ${1} == "backup" ]]; then
 elif [[ ${1} == "restore" ]]; then
   i=1
   declare -A FOLDER_SELECTION
-  if [[ $(find ${BACKUP_LOCATION}/mailcow-* -maxdepth 1 -type d 2> /dev/null| wc -l) -lt 1 ]]; then
-    echo "Selected backup location has no subfolders"
-    exit 1
+  
+  if [[ -z "${NODATE}" ]]; then
+    # No NODATE defined so restore normally
+    if [[ $(find ${BACKUP_LOCATION}/mailcow-* -maxdepth 1 -type d 2> /dev/null| wc -l) -lt 1 ]]; then
+      echo "Selected backup location has no timestamped subfolders"
+      exit 1
+    fi
+  else
+    if [[ $(find ${BACKUP_LOCATION}/* -maxdepth 1 -type d 2> /dev/null| wc -l) -lt 1 ]]; then
+      echo "Selected backup location has no subfolders"
+      exit 1
+    fi
   fi
+  
   for folder in $(ls -d ${BACKUP_LOCATION}/mailcow-*/); do
     echo "[ ${i} ] - ${folder}"
     FOLDER_SELECTION[${i}]="${folder}"