mod_tokenauth: Fix parsing binary part of tokens
Fixes parsing of tokens that happen to have a `;` in their secret part,
otherwise it splits there and the later bit goes into the username and
hitting the "Invalid token in storage" condition.
The Prosody project is open to contributions (see HACKERS file), but is
maintained daily by:
- Matthew Wild (mail: matthew [at] prosody.im)
- Waqas Hussain (mail: waqas [at] prosody.im)
- Kim Alvefur (mail: zash [at] prosody.im)
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