Fix a failing Nominatim test for featuretype

test/geocoders/nominatim.py:259: in test_featuretype_param
    {"latitude": 19.4839446, "longitude": -99.6899716, "delta": 2.0},
test/geocoders/util.py:94: in geocode_run
    **expected)
test/geocoders/util.py:173: in _verify_request
    assert received == expected
E   AssertionError: assert (34.5708167, ...s of America') == (19.4839446 ± ....0e+00, <ANY>)
E     At index 0 diff: 34.5708167 != 19.4839446 ± 2.0e+00
E     Use -v to get the full diff

(The previous coordinates were wrong and pointed to Mexico the country
instead of New Mexico the state, but Pickpoint and OpenMapQuest are still
returning the old coordinates without the `country_codes` filter).

test/geocoders/nominatim.py

@@ -255,8 +255,8 @@ async def test_featuretype_param(self):
 
         await self.geocode_run(
             {"query": "mexico",
-             "featuretype": 'state'},
-            {"latitude": 19.4839446, "longitude": -99.6899716, "delta": 2.0},
+             "featuretype": 'state', "country_codes": "US"},
+            {"latitude": 34.5708167, "longitude": -105.993007, "delta": 2.0},
         )
 
         await self.geocode_run(