[ct] Upgrade input-sk's value attribute so it can be inlined.
[ct] Upgrade input-sk's value attribute so it can be inlined.

-- The lit '.property' syntax can't be used since
input-sk.value can't be set until after render, as it's
backed by the <input>'s value property.

Change-Id: Ice754021e4c31a1bd097635c1c97f38479fbbfd3
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/296726
Auto-Submit: Weston Tracey <e7e27cb74e46abd7b999223aa4f27901ab7e58c6@google.com>
Reviewed-by: Ravi Mistry <9fa2e7438b8cb730f96b74865492597170561628@google.com>
Commit-Queue: Ravi Mistry <9fa2e7438b8cb730f96b74865492597170561628@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot