Fixed: Allow restore to process backups up to ~500MB

(cherry picked from commit 551edb9e655d2a541a2232f85e79a5e3f7b433aa)

src/Radarr.Api.V3/System/Backup/BackupController.cs

@@ -90,6 +90,7 @@ namespace Radarr.Api.V3.System.Backup
         }
 
         [HttpPost("restore/upload")]
+        [RequestFormLimits(MultipartBodyLengthLimit = 500000000)]
         public object UploadAndRestore()
         {
             var files = Request.Form.Files;