for this ticket, set up a heatmap with filters enabled with maptable 1.4.0. testing was done on FF and chromium. i started with this bl.ocks.org and added filters()

note: upon closer inspection, both items below seem to show identical behavior (heatmap grows ever larger)

heatmap changes when clicking "remove" or "new"

steps to reproduce:

1. create a heatmap with filters enabled
2. click "New Filter"
   expected: map is unchanged and new filter options are shown
   actual: heatmap grows larger and new filter options are shown
   work around: don't use filters or reload page
   note: the same is true for when you click "Remove this Filter"

heatmap doesn't update correctly when you add a filter

1. create a heatmap with filters enabled
2. click "New Filter"
3. add the filter by adding filter parameters
   expected: map is filtered and heatmap updates accordingly based on filtered markers
   actual: heatmap grows larger and markers are filtered