ID3v2.3 WXXX (URL) tags parsed incorrectly as UCS-2

[Borewit]

Same issue as reported in aadsm/jsmediatags#126

In version 3.9.3 WXXX (URL) ID3v2.3 tags are being parsed incorrectly as UCS-2 rather than ISO-8859-1. From the spec:

All numeric strings and URLs are always encoded as ISO-8859-1.

Example bytes of a WXXX tag where user_description should be 'あ' (UCS-2 encoded) and data should be https://www.example.com:
57 58 58 58 00 00 00 1E 00 00 01 FF FE 42 30 00 00 68 74 74 70 73 3A 2F 2F 77 77 77 2E 65 78 61 6D 70 6C 65 2E 63 6F 6D

I think the issue was introduced with this change: #120

Repro: https://codepen.io/Quppa/pen/yLNbPpX

Example MP3 (contains just TIT2 and WXXX):
jsmediatags.zip

[Borewit]

Fixed in v6.3.5