Fix PLR when card isn't mounted yet

Fixes a regression from 9bff67bc74

Marlin/src/feature/powerloss.cpp

@@ -100,7 +100,7 @@ void PrintJobRecovery::changed() {
  * If a saved state exists send 'M1000 S' to initiate job recovery.
  */
 void PrintJobRecovery::check() {
-  //if (!card.isMounted()) card.mount();
+  if (!card.isMounted()) card.mount();
   if (card.isMounted()) {
     load();
     if (!valid()) return purge();