This commit takes the existing remove bucket functionality written by
brendanashworth, integrates it to the current UI with a dropdown for
each bucket, and fixes small issues that were present, like the dropdown
not disappearing after the user clicks on 'Delete' for certain buckets.
This feature only deletes a bucket that is empty (that has no objects).
Fixes#4166
This commit fixes an issue where the last item's menu on a list of files
that scrolls gets blocked by the floating add button.
The fix is simply add the same padding that we use for the responsive
view, since it works just fine in responsive.
