remove automatic setup of tokenizer directory

ICU tokenizer doesn't need any extra data anymore, so it doesn't
make sense to create a directory which then remains empty. If a
tokenizer needs such a directory in the future, it needs to create
it on its own and make sure to handle the situation correctly where
no project directory is used at all.

test/python/tools/test_postcodes.py

@@ -63,7 +63,7 @@ class MockPostcodeTable:
 
 @pytest.fixture
 def tokenizer():
-    return dummy_tokenizer.DummyTokenizer(None, None)
+    return dummy_tokenizer.DummyTokenizer(None)
 
 
 @pytest.fixture