Add IDs to lambda_max_failure fixture in RMSD tests

[RMeli]

Add fixture ids to the following fixture:

spyrmsd/tests/test_rmsd.py

Lines 11 to 15 in 08764e1

	@pytest.fixture(autouse=True, params=[True, False])
	def lambda_max_failure(monkeypatch, request):
	"""
	Monkey patch fixture for :code:`lambda_max` function to simulate convergence
	failures.

Currently, only True or False are printed by pytest, which is confusing. See #113 (comment) for context.