Fix case when we have two same prefixes in the name

[eliskovets]

Fix case when we have two same prefixes in the name

Previous behaviour:

>>> from nameparser import HumanName
>>> HumanName("van ma van").as_dict()
{'title': '', 'first': ' ', 'middle': 'van ma', 'last': 'van', 'suffix': '', 'nickname': ''}

Fixed behaviour:

>>> from nameparser import HumanName
>>> HumanName("van ma van").as_dict()
{'title': '', 'first': 'van ma', 'middle': '', 'last': 'van', 'suffix': '', 'nickname': ''}

[eliskovets]

Hello @derek73,
Thank you for the lib, very useful.
Could you please take another looks at this PR? I've pulled changes from the main branch to fix CI.

Thank you!