Update docker-entrypoint.sh

Co-authored-by: J0WI <J0WI@users.noreply.github.com>
Signed-off-by: Antonin Delpeuch <antonin@delpeuch.eu>

docker-entrypoint.sh

@@ -157,7 +157,7 @@ if expr "$1" : "apache" 1>/dev/null || [ "$1" = "php-fpm" ] || [ "${NEXTCLOUD_UP
         if version_greater "$image_version" "$installed_version"; then
             echo "Initializing nextcloud $image_version ..."
             if [ "$installed_version" != "0.0.0.0" ]; then
-                if [ ${majorImage%%.*} -gt $((${majorInstalled%%.*} + 1)) ]; then
+                if [ "${image_version%%.*}" -gt "$((${installed_version%%.*} + 1))" ]; then
                     echo "Can't start Nextcloud because upgrading from $installed_version to $image_version is not supported."
                     echo "It is only possible to upgrade one major version at a time. For example, if you want to upgrade from version 14 to 16, you will have to upgrade from version 14 to 15, then from 15 to 16."
                     exit 1