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When all the sites fit on a single row (as is the case for most
devices now that only 4 sites are shown), hide the "Show more"
option and allow only compact mode.

Bug: 860799
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: If2efa48bcd1cbe23c49b34be4ec084f95a703d08
Reviewed-on: https://chromium-review.googlesource.com/1143464Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Commit-Queue: Elodie Banel <lod@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576505}