title: leaflet-draw delete button remove "clear all" action
body: <p>How can I remove the "clear all" action from the delete button in the <a href="https://github.com/Leaflet/Leaflet.draw" rel="noreferrer">leaflet-draw</a> edit toolbar?</p>
  
  <p>I know you can remove the whole <a href="https://stackoverflow.com/questions/40414970/disable-leaflet-draw-delete-button">delete</a> button but still need to remove individual items.
  Basically looking for a way to prevent the user from deleting every item from the map.</p>