removed constraint on start location

tests/test_flatland_env_sparse_rail_generator.py

@@ -38,6 +38,3 @@ def test_sparse_rail_generator():
     # reset to initialize agents_static
     env_renderer = RenderTool(env, gl="PILSVG", )
     env_renderer.render_env(show=True, show_observations=True, show_predictions=False)
-
-
-test_realistic_rail_generator()