Remove unused variables in QuicVersionsTest.QuicEnableVersion.
Remove unused variables in QuicVersionsTest.QuicEnableVersion.

gfe-relnote: n/a (test only)
PiperOrigin-RevId: 276485378
Change-Id: I1bcc9a9323920d3d6837846ca40a4a56d0d16baf

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