Small fix to be able to use mac and vendor in "device_tracker_new_device" event. (#10537)

* Small fix to be able to use mac and vendor in EVENT_NEW_DEVICE event

* Missed device_tracker test

tests/components/device_tracker/test_init.py

@@ -481,6 +481,8 @@ class TestComponentsDeviceTracker(unittest.TestCase):
         assert test_events[0].data == {
             'entity_id': 'device_tracker.hello',
             'host_name': 'hello',
+            'mac': 'MAC_1',
+            'vendor': 'unknown',
         }
 
     # pylint: disable=invalid-name