Fix openwebui update script when backup directory already exists (#3213)

ct/openwebui.sh

@@ -29,7 +29,7 @@ function update_script() {
   fi
   msg_info "Updating ${APP} (Patience)"
   cd /opt/open-webui
-  mkdir /opt/open-webui-backup
+  mkdir -p /opt/open-webui-backup
   cp -rf /opt/open-webui/backend/data /opt/open-webui-backup
   git add -A
   $STD git stash
@@ -61,4 +61,4 @@ description
 msg_ok "Completed Successfully!\n"
 echo -e "${CREATING}${GN}${APP} setup has been successfully initialized!${CL}"
 echo -e "${INFO}${YW} Access it using the following URL:${CL}"
-echo -e "${TAB}${GATEWAY}${BGN}http://${IP}:8080${CL}"
+echo -e "${TAB}${GATEWAY}${BGN}http://${IP}:8080${CL}"