Make AoI Download button less pushy
Make AoI Download button less pushy

Previously the final Analyze tab would be pushed down a few
pixels because of the Download button's inherited padding
from .btn. By setting its padding-bottom to 0, we ensure
that all the Analyze tab headers line up.

Refs #2660

WikiWatershed/model-my-watershed,WikiWatershed/model-my-watershed,WikiWatershed/model-my-watershed,WikiWatershed/model-my-watershed,WikiWatershed/model-my-watershed