Fix incorrect glslang git hash. Bug: angleproject:3227 Change-Id: I3bbdb6956cf97298eff9bd2a766d048f1de4a70f Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1531538 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>