Fix/in modified state still click buttons

[meganrm]

Problem

If you held down a modifier key and then clicked another camera control key, like the up button, it would break the state indicator (ie you'd still be in pan state, but the toggle button would show rotate state)
resolves #150

Solution

Check to see if a modifier is being held in key up listener
with @pairperson1

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

Steps to Verify:

1. npm start
2. hold down shift
3. click down or up button
4. let go of shift
5. rotate toggle button should switch only once you release the shift button