[5.4] Fix for withOverlapping, the scheduled task would not resume (#…

…19419)

* Fix for withOverlapping, the scheduled task would not resume if an error occurred. This adds a last resort handler to clean up the mutex bit if the application ended unexpectedly

* Update CallbackEvent.php

src/Illuminate/Console/Scheduling/CallbackEvent.php

@@ -60,6 +60,10 @@ public function run(Container $container)
             return;
         }
 
+        register_shutdown_function(function()  {
+            $this->removeMutex();
+        });
+
         try {
             $response = $container->call($this->callback, $this->parameters);
         } finally {