bug#29595: 26.0.90; menu items show incorrect shortcut keys

[Paul Rankin]

The GUI build of Emacs 26.x shows incorrect shortcut keys in the menu: either 
⇧C (shift-C) or ⇧M (shift-M). See attached screenshot or 
https://imgur.com/a/fQaly

These are displayed in the macOS native menu style, while the Emacs duplicated 
shortcuts in parentheses are still correct.

To reproduce:

1. emacs -Q
2. click a menu item

Expected results:

Menu items should show correct shortcut cut keys.

Actual results:

Menu items show combination of incorrect keys with OS native display and 
correct keys in Emacs's duplicates.

Configuration:

GNU Emacs 26.0.90 (build 1, x86_64-apple-darwin17.2.0, NS appkit-1561.10 
Version 10.13.1 (Build 17B48)) of 2017-11-05

macOS 10.13.1 (17B1003)

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Screen Shot 2017-12-07 at 11.26.08 am.jpg
Description: JPEG image