Fix typo in BlinkGenPropertyTrees expectation directory name

This patch fixes a typo in https://crrev.com/612683 where the wrong
directory name was used (enable-features=... instead of
enable-blink-features=...). This typo slipped in because the
property bot is failing for infra reasons (https://crbug.com/910859).

NOTRY=true

Bug: 836884
Change-Id: I88d38247fc0501d21af058852e2694b2ee432722
Reviewed-on: https://chromium-review.googlesource.com/c/1356964
Commit-Queue: Philip Rogers <pdr@chromium.org>
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613088}
95 files changed