mediawiki.searchSuggest: Show full article title as a tooltip for each suggestion

The text can be truncated, so let's do this to make it always possible
to actually see where the link leads.

Change-Id: I84fbae5a223be89e2d8918cb6fc45d88273fc6f4
Merge "mediawiki.searchSuggest: Show full article title as a tooltip for each suggestion"