Previously, PM only tags were being routed to the public topic list with
the tag added as a filter. However, the public topic list does not fetch
PMs and hence PM only tags did not provide any value when added to the
Sidebar. This commit changes that by allowing the client to
differentiate PM only tag and thus routes the link to the PM tags show
route.
Counts for PM only tags section links are not supported as of this
commit and will be added in a follow up commit.
3deabb00d4