State screen does not reflect force arrows

[loganbraywork]

Test Device

Windows 10

Operating System

Windows 10 1903

Browser

Firefox 76.0.1

Problem Description

For phetsims/qa#501

This appears to be the result of the bug mentioned in #274. The state screen appears to reflect the correct position of the force arrows, while the original screen reflects the bugged arrow positions.

Steps to Reproduce

1. Select adjustable attraction
2. Select show repulsive and attractive force arrows
3. Pause simulation
4. Move atom closer to the fixed atom
5. Switch to argon atoms
6. Switch back to adjustable attraction atoms
7. Unpause simulation

Visuals

[jbphet]

@arouinfar and I reviewed this on 5/29/2020 and we decided that it does not need to be fixed for an early customer dev release (since the customer is not expected to use this screen), but it should be addressed before a full phet-io release of this sim.

[jbphet]

This is now fixed, see the description in #274 (comment).

@KatieWoe - please check on master. If it looks good, go ahead and close, since it has the same root cause as #274 so we don't need to re-verify on the next release.

[KatieWoe]

Looks good on master