htmlBody: wrong tag when reconstructing the body? (opening with html closing with head)

extract-msg        0.55.0
python                3.14.5

Hi and thank you for your work.

In `msg_classes/message_base.py` line 1181 we have

```python
htmlBody = f'<html><body>{correctedBody}</body></head>'.encode('ascii', 'xmlcharrefreplace')
```

i.e. opening with <html> and closing with </head>, which I believe is mistake.

Bests