carte: disable tiles layer during tests
carte: disable tiles layer during tests

During integration tests, we don't want to load the tiles from OSM:

- It hits OSM servers during every test run;
- It it slow (Capybara waits for the tiles to be loaded to proceed);
- It makes test time out when tiles cannot be loaded for some reason.

Fix #3913
sgmap/tps,sgmap/tps,sgmap/tps