Allow M524 between M23 and M24

Marlin/src/gcode/sd/M524.cpp

@@ -34,6 +34,8 @@ void GcodeSuite::M524() {
 
   if (IS_SD_PRINTING())
     card.flag.abort_sd_printing = true;
+  else if (card.isMounted())
+    card.closefile();
 
 }