zot: fix missing var (Dev -> Main) (#5056)

Author: MickLesk

install/zot-registry-install.sh

@@ -31,7 +31,7 @@ $STD htpasswd -b -B -c /etc/zot/htpasswd admin "$ZOTPASSWORD"
   echo "Zot User: admin"
   echo "Zot Password: $ZOTPASSWORD"
 } >>~/zot.creds
-echo "${RELEASE}" >~/.${APP}
+echo "${RELEASE}" >~/.${APPLICATION}
 msg_ok "Installed Zot Registry"
 
 msg_info "Setup Service"