Remove python version check in presubmit This script should now always be run under python3 due to https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3739269 Bug: angleproject:7475 Change-Id: I12ddb42b074959aec36731d121282a81c46bc5ff Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3749136 Commit-Queue: Eddie Hatfield <eddiehatfield@google.com> Reviewed-by: Cody Northrop <cnorthrop@google.com>