Update expected ALPN token in QuicDispatcherWriteBlockedListTest.
Update expected ALPN token in QuicDispatcherWriteBlockedListTest.

This is so that when cl/290840338 reorders QUIC versions, QuicDispatcherWriteBlockedListTests (running with CurrentSupportedVersions().front() only) can still pass.

gfe-relnote: n/a (test-only change)
PiperOrigin-RevId: 297568815
Change-Id: I39a6e14ada0e21d57d2cb090b0c5c11837d49f9b

google/quiche,google/quiche,google/quiche,google/quiche