infra: Remove ssd:0 from builderless config. Unsure why we added this requirement in the past. We shouldn't need to explicitly specify a ssd dimension for the bots. Removing to simplify the migration to .star files. Bug: angleproject:5559 Change-Id: I55484dec74e4274013390d378678824a3ed0778a Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2678865 Reviewed-by: Yuly Novikov <ynovikov@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>