search-by-tags returns "home" notes - fixes #933

What does this MR do?

search-by-tags now returns "home" notes - fixes #933 (closed)

featured / trending tags count both "home" and "public" notes, so this should do the same

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added bugbackend label

requested review from @CenTdemeern1, @fEmber, @Marie, and @tess

approved this merge request

approved this merge request

merged

mentioned in commit 816ce293