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We were counting non-default suggestions with a relevance of 0, which
would later be removed anyways, in our logic to decide whether to
favor or squelch tail suggestions within a round of suggestions.
This CL now ignores them (unless they're the default, of course).

Bug: 1023821
Change-Id: If6a8a49cf6f2f53b487d2a18343af9bc038c33f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1906963
Commit-Queue: Kevin Bailey <krb@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714546}