globalShortcuts don't work for alternate keyboards on Mac 10.14.6

* **Electron Version:**
* 6.0.2
* **Operating System:**
* mac 10.14.6

### Expected Behavior
globalShortcuts work regardless of the chosen keyboard layout

### Actual Behavior
On Mac, globalShortcuts seem to default to either qwerty or the keyboards layout (I think? I don't have a dvorak keyboard) rather than the chosen keyboard layout.

### To Reproduce
Here's a fiddle that I tested on all three platforms. Windows works perfectly, Linux work with a caveat that it doesn't pick up keyboard changes made while the app is running, and Mac is broken.

https://gist.github.com/Kilian/995123ef2e31d6d15ee147a613831bed

To test this, add dvorak to your keyboard layouts. If set to Dvorak, the `l` is in the position of the `p` on a qwerty layout. If you press `ctrl + p` on a physical qwerty keyboard but are using the dvorak layout that should correspond to `ctrl + l` and pressing it should give a console.log in fiddle.