jquery.suggestions: Remove dead code for returning options
returnValue = (key in obj) ? undefined : obj[key];
By standard, this cannot return anything other undefined.
This code has been broken since the introduction of the module
in 2012 (
32377424b, r72349).
The functionality also didn't have test (naturally), and isn't
used anywhere in Wikimedia Git. Simply remove it.
Also remove the confusing $() wrapping of the non-getter return
value that provides chainability.
The 'this' inside a jQuery method is already an instance of jQuery,
pulling it through $() again achieves very little.
Change-Id: Id13861d42b65a759d74670d8c5850aecee4daf7d