dashboard: do renderMap even if count has not changed

Signed-off-by: Gregory Meno <gregory.meno@inktank.com>
Merge pull request #44 from ceph/wip-8720

dashboard: do renderMap even if count has not changed
pgmap-view.js: Fix comment to reflect new "always update" behavior

Fixes: #9020
Signed-off-by: Dan Mick <dan.mick@inktank.com>
Merge branch '1.2'