Fix script

Signed-off-by: Jean-Yves <7360784+docjyJ@users.noreply.github.com>

start.sh

@@ -5,7 +5,7 @@ AIO_LOCK="/opt/stalwart-mail/aio.lock"
 DATA_VERSION="0.7.0"
 
 if [ -f "$AIO_LOCK" ]; then
-    if ! cmp --silent <$(cat "$AIO_LOCK") <$(echo "$DATA_VERSION"); then
+    if [ "$DATA_VERSION" != "$(cat "$AIO_LOCK")" ]; then
         echo "Your data is in an old format."
         echo "Make a backup and see https://github.com/nextcloud/all-in-one/blob/main/community-containers/stalwart/readme.md"
         echo "To avoid any loss of data, Stalwart will not launch."