Fix use of EXPECT_QUIC_BUG in two tests These calls match QUIC_BUG so they should use EXPECT_QUIC_BUG. This was found when working on improving QUIC_BUG. gfe-relnote: n/a, test-only PiperOrigin-RevId: 296005794 Change-Id: I5e73ab2064b478f0824d5b94be1ba696b267397a