fix: remove standalone version

install_script_standalone.sh

@@ -948,7 +948,6 @@ main() {
   clear
   echo_content red "\n=============================================================="
   echo_content skyBlue "System Required: CentOS 7+/Ubuntu 18+/Debian 10+"
-  echo_content skyBlue "Version: v2.2.0"
   echo_content skyBlue "Description: One click Install Trojan Panel standalone server"
   echo_content skyBlue "Author: jonssonyan <https://jonssonyan.com>"
   echo_content skyBlue "Github: https://github.com/trojanpanel"