Editor: keyboard shortcuts button is viewable on a touch device

[davewhitley]

What I expected

I did not expect to see the keyboard shortcuts button on my device that did not have a keyboard.

Screenshot / Video

[nylen]

This is not possible. The browser doesn't offer an API to determine whether the device has a keyboard.

There are also lots of edge cases like touch+keyboard laptops, even devices where the keyboard is sometimes available and sometimes not. More info about why hardware capabilities detection in general is problematic - http://stackoverflow.com/a/18001239/106302 and our touchDetect in particular - #1479