Stacked plots need to align the Y axis

[charlesh88]

Testing Instructions:

1. Create 3 SWGs one with very large amplitude value (eg: 100000000)
2. Create Overlay plot and Add couple of SWG.
3. Create stack Plot, Add all SWG and observe y axis shifts to adjust new width.
4. Try to add remove plots from Overlay and Stack plot to observe correct width on y axis.
5. Also navigate to child SWG inside Stack plot and back to Stacked plot to observe correct width on y axis.

[charlesh88]

Testathon 9-30-21: NOT fixed. Alignment works if the user adds end points that need more space, but if a end point is added that needs less space, that item is not sized properly:

Replicate:

1. On banner, make a stacked plot.
2. In this order, add WheelOdometry > wVelocity, xVelocity, yVelocity.
3. Observe: yVelocity margin is less than the two proceeding.

Saving, navving away and back does cause the alignment to work properly, but it should update while editing.

[shefalijoshi]

Partially fixed - while actively adding telemetry endpoints the y-axis is still not aligned for multiple endpoints.
Refreshing does align them.

[shefalijoshi]

Verified fixed.