Move registering events to "booted" rather than "registered" so they …

…are registered.

src/BackupServiceProvider.php

@@ -36,15 +36,15 @@ public function configurePackage(Package $package): void
 
     public function packageBooted()
     {
+        $this->app['events']->subscribe(EventHandler::class);
+
         if (EncryptBackupArchive::shouldEncrypt()) {
             Event::listen(BackupZipWasCreated::class, EncryptBackupArchive::class);
         }
     }
 
     public function packageRegistered()
     {
-        $this->app['events']->subscribe(EventHandler::class);
-
         $this->app->singleton(ConsoleOutput::class);
 
         $this->app->bind(CleanupStrategy::class, config('backup.cleanup.strategy'));