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As per UXimpl feedback, remove showing indices for emoji suggestions.

Bug: b/165761951
Change-Id: Idc5363b71a6992b31db0d450516332b929d3c73c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2371423Reviewed-by: Darren Shen <shend@chromium.org>
Commit-Queue: My Nguyen <myy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800913}