Map should not zoom every time

[Gregliest]

On the Run Map page, if you click a marker to see a Reach Detail page, and then go back, the map will zoom back out to all points. This is annoying if you are trying to explore reaches in a particular area.

Desired behavior:

• Only auto zoom if the filter changes.

[yeahphil]

Fixed this in the referenced commit... but I lost zooming animations in the process because of timing changes (the animation is happening as the filter controller dismisses).

Is that important?

[Gregliest]

I think that's an improvement, so yeah, should be fine. We can figure out how to add it back if we want later.