SkQP: remove threshold for imageblurclampmode am: 057fc1477e am: b6c2c7c443

Original change: https://android-review.googlesource.com/c/platform/external/skqp/+/2227541

Change-Id: I3bfea5e47c01d4569c9b0e3526b73a6ceb36c162
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>