Reduce VRAM budget on one perf bot

This will let us see the reordered_dags_over_budget stat
in perf so that we know our fallback code path is getting tested.

Bug: skia:10877
Change-Id: I073c8622ddb8f3449511193bac045bfebc4e277c
Cq-Include-Trybots: luci.skia.skia.primary:Perf-Debian10-Clang-NUC7i5BNK-GPU-IntelIris640-x86_64-Release-All
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/398217
Reviewed-by: Ravi Mistry <rmistry@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
Auto-Submit: Adlai Holler <adlai@google.com>
5 files changed