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

(cherry picked from commit 551edb9e655d2a541a2232f85e79a5e3f7b433aa)

src/Readarr.Api.V1/System/Backup/BackupController.cs

@@ -90,6 +90,7 @@ public object Restore(int id)
         }
 
         [HttpPost("restore/upload")]
+        [RequestFormLimits(MultipartBodyLengthLimit = 500000000)]
         public object UploadAndRestore()
         {
             var files = Request.Form.Files;