bench: Fix a couple presumed copy/paste errors

We switch to FILTER_HEIGHT_SMALL when fIsSmall.

Change-Id: I5d21eacbee29a349caa96815b2059c0bebd819e2
Reviewed-on: https://skia-review.googlesource.com/c/190563
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
2 files changed