[tests] fixup dbcrash interaction with add_nodes()

Author: jnewbery

test/functional/dbcrash.py

@@ -64,7 +64,7 @@ def set_test_params(self):
 
     def setup_network(self):
         # Need a bit of extra time for the nodes to start up for this test
-        self.add_nodes(self.num_nodes, timewait=90)
+        self.add_nodes(self.num_nodes, extra_args=self.extra_args, timewait=90)
         self.start_nodes()
         # Leave them unconnected, we'll use submitblock directly in this test