Removing calls to deprecated functionality in favor of the new versions. Old version...

Removing calls to deprecated functionality in favor of the new versions. Old version worked fine but shouldn't be used.

Follows-up:
* r75275: Introduced the updateTooltipAccessKeys function in the new library but didn't call it on document ready and left the deprecated one in the onloadhook-run in wikibits.js untouched
* r75287: Introduced jquery.checkboxShiftClick and called on-load but left the load call for the legacy version untouched. Depending on the load order at any given time it may not have been used.

Also reordering the if-else case in mw.util.updateTooltipAccessKeys to allow a call without arguments ("undefined instanceof Foo" throws exception)