Fix the typo in clifford_gate_test::test_commutes_pauli (#4149)
Fix the typo in clifford_gate_test::test_commutes_pauli (#4149)

Although the original test is still theoretically correct, it doesn't make sense to make the expected result with an exponent but call the actual `commutes` function without an exponent. And I guess 0.1 was a typo for 1.0.

There was another error revealed when I tried to fix it -- `cirq.allclose_up_to_global_phase(mat, mat_swap)`. "Up to gloabl phase" means both commutive and anti-commutive operators return ture, which is not desired.
quantumlib/Cirq,quantumlib/Cirq,quantumlib/Cirq,quantumlib/Cirq,quantumlib/Cirq