Merge pull request #11788 from overleaf/msm-missing-quote

[CE] added missing quote in shutdown script

GitOrigin-RevId: 76e16bcc1cab29c6cdf261ec7e425adc5520d8f4

server-ce/init_preshutdown_scripts/00_close_site

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-SITE_MAINTENANCE_FILE_BAK="$SITE_MAINTENANCE_FILE.bak.shutdown
+SITE_MAINTENANCE_FILE_BAK="$SITE_MAINTENANCE_FILE.bak.shutdown"
 
 mv "${SITE_MAINTENANCE_FILE}" "${SITE_MAINTENANCE_FILE_BAK}"
 echo "closed" > "${SITE_MAINTENANCE_FILE}"