Use name field only for author name

It feels janky to remove a more granular name designation, but all these
first/last name fields were algorithmically populated by a dubious
process of splitting the name by a space character. If it makes sense to
have first/last name fields, it should be re-added with some
consideration.

bookwyrm/connectors/abstract_connector.py

@@ -178,8 +178,7 @@ class AbstractConnector(AbstractMinimalConnector):
         author_text = []
         for author in self.get_authors_from_data(data):
             book.authors.add(author)
-            if author.display_name:
-                author_text.append(author.display_name)
+            author_text.append(author.name)
         book.author_text = ', '.join(author_text)
         book.save()