show review vote counts only for Proposed bugs
For Proposed blockers, it makes sense to display vote counts (e.g. +3,0,-1). But
for Accepted blockers, it doesn't really make sense, because it doesn't include
the votes from the meeting (where it could've been accepted), and therefore it
often seems confusing (e.g. an accepted blocker which is +0,0,-0 or even
+0,0,-1).
Fixes: https://pagure.io/fedora-qa/blockerbugs/issue/177