🐛 fix rule checker not parsed

tests/test_rule.py

@@ -0,0 +1,18 @@
+import pytest
+from nonebug import App
+
+
+@pytest.mark.asyncio
+async def test_command(app: App):
+    from nonebot.consts import CMD_KEY, PREFIX_KEY
+    from nonebot.rule import Rule, CommandRule, command
+
+    test_command = command("help")
+    dependent = list(test_command.checkers)[0]
+    checker = dependent.call
+
+    assert isinstance(checker, CommandRule)
+    assert checker.cmds == [("help",)]
+
+    state = {PREFIX_KEY: {CMD_KEY: ("help",)}}
+    assert await dependent(state=state)