Fix dangling container
Fix dangling container

If the loadingControl was separate from the zoomControl, removing it
left behind its container. This fixes the issue by calling the
overridden method when the indicator is separate.

DrillingInfo/Leaflet.loading,DrillingInfo/Leaflet.loading,laurenancona/Leaflet.loading,ebrelsford/Leaflet.loading,NBTSolutions/Leaflet.loading,NBTSolutions/Leaflet.loading