Remove vertical metrics assertion

The platform can handle per font vertical metrics, so no longer need
to check the vertical metrisc to be consitent with Roboto metrics.

Bug: 416160754
Test: m fontchain_lint
Flag: build.RELEASE_USE_ROBOTO_MONO_FONT
Change-Id: I40bfbf82d1f073a5dc68ae3c8e75875a2facb104