fix: MacOS Screenshot Issue

[nmkettler]

Checklist

• [x] The code has been run through pretty yarn run pretty
• [x] The tests pass on CircleCI
• [x] You have referenced the issue(s) or other PR(s) this fixes/relates-to
• [x] The PR Template has been filled out (see below)
• [x] Had a beer/coffee because you are awesome

What?

The CanvasWidget locks up after taking a screenshot on MacOS.

Why?

This can be replicated by Shift + Cmd + 4. The canvas "freezing" occurs because it pops up Preview as you're letting go of the shift key, and the browser doesn't detect the key up event

How?

This clears the Action Event Bus keys on keydown so the screenshot will still take but not lock the canvas (shoutout to chaiyixiao for the help with this too)

Feel good image:

[dylanvorster]

I still have this issue, but want to find a better way to solve this, perhaps with some kind of OS adapter on the event bus