jquery.suggestions, mediawiki.searchSuggest: Don't use jquery.autoEllipsis

(How's that for a loaded commit topic, huh?)

We can just use text-overflow: ellipsis, which is widely supported
these days. The result is a lot less code being loaded on every page
view and a lot less processing being done on the suggestions.

This changes the position of the ellipsis from the "middle" of the
text to the end of it. I don't think this is a problem.

Bug: 30309
Bug: 59172
Change-Id: I6fc229a292a90a3cbb945b58061ee99b0ac7f97d