fix: remove body limit for admin app

The BodyLimit is needed for large PUTs in the s3 api server, but
the admin server requests are not expected to exceed the default
4MB limit.

cmd/versitygw/main.go

@@ -250,7 +250,6 @@ func runGateway(ctx *cli.Context, be backend.Backend, s auth.Storer) error {
 	admApp := fiber.New(fiber.Config{
 		AppName:      "versitygw",
 		ServerHeader: "VERSITYGW",
-		BodyLimit:    5 * 1024 * 1024 * 1024,
 	})
 
 	var admOpts []s3api.AdminOpt