search: clicking a search suggestion no longer appends filters
Created by: limitedmage
Search suggestions already come with all the existing filters added, so there is no need to add them to the URL when generating the link.
Also fixes a small bug that caused filters to not be toggled properly (eg. after clicking on "lang:c++" and then on "lang:c", the result would be "++" instead of "lang:c++ lang:c". Gif of this bug: