Revert "OS X: rename special menu items instead of duplicating"

This reverts commit 8c538d10da618add00aba1acbc8d8dc2f24445b4.
This patch, unfortunately, do not combine well with another
problematic code producing, as a result, a serious regression.
While the proper/better fix in Cocoa menu not found, I'm reverting
this patch.

Change-Id: I1ff03dbe12805da447cb3cfe3e2f231528bf1a16
Task-number: QTBUG-43471
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@theqtcompany.com>