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This matches the threshold applied on other platforms in ValueToButton.
Also set the touched state for all non-zero values, and fix a typo in
the comments.

BUG=1073130

Change-Id: Ied8db827b098c95b6a697f1df8a940de1a501166
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2245484Reviewed-by: Matt Reynolds <mattreynolds@chromium.org>
Commit-Queue: Andrew Walbran <qwandor@google.com>
Cr-Commit-Position: refs/heads/master@{#781281}