test: fix incorrect test name

The test name was incorrect as the test is testing a type vectorizer,
not column vectorizer.

tests/test_vectorizers.py

@@ -32,7 +32,7 @@ def hstore_vectorizer(column):
 
         return Article
 
-    def test_uses_column_vectorizer(self, Article, session):
+    def test_uses_type_vectorizer(self, Article, session):
         article = Article(name={"fi": "Joku artikkeli", "en": "Some article"})
         session.add(article)
         session.commit()