Limits not updating in profile and histogram viewer when enabling normalization

[astrofrog]

When clicking on the normalize icon, the limits don't change - and one has to hit the 'home' icon to adjust the limits.

[astrofrog]

This also doesn't work when hitting the cumulative button in the histogram viewer

[Carifio24]

This is the same issue that I noticed in #381. I didn't have time to pin down the exact cause, but I believe it's related to communication with the frontend widget since this problem doesn't occur if you set viewer.state.cumulative or viewer.state.normalize directly (e.g. in a code cell rather than using the widget button).

[astrofrog]

@Carifio24 - ah interesting!