Teapot chunks load too close together studio

[KatieWoe]

For phetsims/qa#488. Issue with State found in Studio.
When you have the teapot turned on to a small degree the chunks are spread out. However, when you then launch the sim, the chunks load close together, as if the teapot was fully on.

[chrisklus]

Nice catch @KatieWoe, thanks! The preloading of the energy chunks was only dependent on the tea kettle's internal energy, so if the burner was on really low but the tea kettle was hot, the chunks would load close together. I matched the behavior so that if the burner is on, the chunks are preloaded using the burner setting. If the burner is off (but the tea kettle is still warm), then it bases the chunks off of its internal energy.

I've tested this a bit on my own, but will mark for QA to verify in the RC.

[KatieWoe]

This looks ok in phetsims/qa#528. Will reopen if something comes up.

[jbphet]

Reopening to test on 1.4.0-rc.2, since the way that energy chunk state is handled has been completely revamped.

[KatieWoe]

This does not seem to occur in rc.2 will reopen if something comes up.