format code with gofumpt

gofumpt (https://github.com/mvdan/gofumpt) provides a supserset of `gofmt` / `go fmt`,
and addresses various formatting issues that linters may be checking for.

We can consider enabling the `gofumpt` linter to verify the formatting in CI, although
not every developer may have it installed, so for now this runs it once to get formatting
in shape.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

registry/auth/silly/access.go

@@ -70,7 +70,6 @@ func (ac *accessController) Authorized(ctx context.Context, accessRecords ...aut
 	ctx = dcontext.WithLogger(ctx, dcontext.GetLogger(ctx, auth.UserNameKey, auth.UserKey))
 
 	return ctx, nil
-
 }
 
 type challenge struct {