crypt: fix uploads with --crypt-no-data-encryption

Before this change, when uploading to a crypt, the ObjectInfo
accidentally used the encrypted size, not the unencrypted size when
--crypt-no-data-encryption was set.

Fixes #5498

backend/crypt/crypt.go

@@ -999,6 +999,9 @@ func (o *ObjectInfo) Size() int64 {
 	if size < 0 {
 		return size
 	}
+	if o.f.opt.NoDataEncryption {
+		return size
+	}
 	return o.f.cipher.EncryptedSize(size)
 }