Fix bugs when configuring database session within threads.

This got missed during a recent refactor.

tailbone/views/products.py

@@ -345,7 +345,7 @@ class CreateProductsBatch(ProductsGrid):
     def make_batch(self, provider, progress):
         from rattail.db import Session
         session = Session()
-        configure_session(session)
+        configure_session(self.request.rattail_config, session)
 
         self._filter_config = self.filter_config()
         self._sort_config = self.sort_config()