Multitouch interaction with collections allows for movement of atom outside of boundry

[loganbraywork]

Test device
IPad 6th generation
Operating System
IOS 13
Browser
Safari
Problem description
For phetsims/qa#479

If an atom is held and the collection is changed using multitouch, then when returning to the inital collection it is still possible to manipulate atom outside of bounderies
Steps to reproduce

1. Complete at least 1 collection
2. Lift up an atom using one finger
3. Without releasing the atom, use multitouch to switch collections
4. Switch collections back to initial while continuing to hold atom
5. Drag atom towards buckets and observe
   Visuals
   

[Denz1994]

The drag events for other atoms are now interrupted while dragging or interacting with other touch events. Will release dev version for comparison.

[Denz1994]

The interrupt also occurs when the collections are swapped. Can you confirm this was fixed in this dev version @loganbraywork?

[loganbraywork]

Also assigning @KatieWoe due to having no access to an IPad currently due to the coronavirus pandemic

[KatieWoe]

Seems fixed in that dev version