This commit fixes the following scenario:
1. The user is searching for hashtags in chat, where the subcategory
type is not highest-ranked in priority order.
2. There can, but doesn't have to be, a higher-ranked matching chat
channel that has the same slug as the subcategory.
3. Since it is not the highest-ranked type, the subcategory, which
normally has a ref of parent:child, has its ref changed to
child::category, which does not work
This was happening because whenever a hashtag type was not highest
ranked, if _any_ other hashtag results conflicted slugs, we would
append the ::type suffix. Now, we only append this suffix if a
higher-ranked type conflicts with the hashtag, and we use the current ref
to build the new typed ref to preserve this parent:child format as well,
it's more accurate.
86204fa4f0