cborencoder: Fix cbor_encode_raw

`append_to_buffer` now expects to be told what we're appending, since
the docs here say `raw` must be valid CBOR, it seems
`CborEncoderAppendCborData` is the most appropriate value here.

src/cborencoder.c

@@ -501,7 +501,7 @@ CborError cbor_encode_byte_string(CborEncoder *encoder, const uint8_t *string, s
  */
 CborError cbor_encode_raw(CborEncoder *encoder, const uint8_t *raw, size_t length)
 {
-    return append_to_buffer(encoder, raw, length);
+    return append_to_buffer(encoder, raw, length, CborEncoderAppendCborData);
 }
 
 /**