Reset magnetized bubble after click

Fixes: 154867714
Test: manual
1) Have five bubbles in stack
2) Select 4th bubble
3) Add new bubble => see that 4th bubble animates to 5th place instead
of staying in 4th place and leaving 5th place blank

Change-Id: I8e4a9911c09a2335b21bd43527c389e6e0efb86c