test(lfx): drop obsolete inputs kwarg from capability stream-close test

Coordinator.stream() no longer takes an inputs parameter (the streaming path
reads initial_inputs from runtime_options); update the capability routing
stream-close test to the current signature.

Author: ogabrielluiz

src/lfx/tests/unit/execution/test_capability_routing.py

@@ -227,7 +227,7 @@ def is_untrusted_node(self, _node: dict[str, Any], _context: CapabilityContext |
         capability_service=capability_service,
     )
 
-    stream = coordinator.stream(SimpleNamespace(), inputs=[{}])
+    stream = coordinator.stream(SimpleNamespace())
     assert await anext(stream) == "tick"
     await stream.aclose()
     await asyncio.sleep(0)