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[roundtrip-test] Use API v2 for doubleRoundtripDiff too

Authored by marcoil.

Description

[roundtrip-test] Use API v2 for doubleRoundtripDiff too

This should fix the differences in semantic/syntactic
classification with results when using API v1.

Change-Id: I734cca8047044382c09b09fe0513d613f8d983de