Fix match searching in names+issues

"match" won't work on just one property (like name or content); it always searches both of those.

the "match" operator in WQL was implemented mostly with the site search (search bar) in mind, and it's a bit wonky in there.  In sites with postgres fulltext working (like all the wagn sites run by GC), the search is implemented to search on an index of name and content.

but if you search on {:name=>[:match,'hosting']}, for example, you clearly want just the ones that match name.