remove old code

Author: wjordan213

sqlalchemy_continuum/manager.py

@@ -159,7 +159,7 @@ def reset(self):
 
         self.metadata = None
 
-    def after_begin(self, session, _tx, _conn):
+    def after_begin(self, session, tx, conn):
         if not self.options['versioning'] or not self.options['native_versioning']:
             return
 
@@ -170,8 +170,6 @@ def after_begin(self, session, _tx, _conn):
         # result of fetchone() is a Tuple[int]
         self.native_transaction_id = session.execute(stmt).fetchone()[0]
 
-        self.after_begin_called = True
-
     def transaction_args(self, session):
         args = {}
         for plugin in self.plugins: