fix with_expression() stub (#166)

Noticed when going over sqlalchemy/sqlalchemy#6950

Author: zzzeek

sqlalchemy-stubs/orm/strategy_options.pyi

@@ -124,9 +124,7 @@ class _undefer_group_loader_option(loader_option):
 
 class _with_expression_loader_option(loader_option):
     def fn(self, loadopt: _L, key: Any, expression: Any) -> _L: ...
-    def _unbound_fn(
-        self, loadopt: _L, key: Any, expression: Any
-    ) -> _UnboundLoad: ...
+    def _unbound_fn(self, key: Any, expression: Any) -> _UnboundLoad: ...
 
 class _selectin_polymorphic_loader_option(loader_option):
     def fn(self, loadopt: _L, classes: Any) -> _L: ...