fix: do not try to render drawinTooltip on drawing start

The event does not contain latlng, so we cannot compute the
line length yet.

umap/static/umap/js/umap.controls.js

@@ -1319,10 +1319,7 @@ U.ContextMenu = L.Map.ContextMenu.extend({
 U.Editable = L.Editable.extend({
   initialize: function (map, options) {
     L.Editable.prototype.initialize.call(this, map, options)
-    this.on(
-      'editable:drawing:start editable:drawing:click editable:drawing:move',
-      this.drawingTooltip
-    )
+    this.on('editable:drawing:click editable:drawing:move', this.drawingTooltip)
     this.on('editable:drawing:end', (e) => {
       this.closeTooltip()
       // Leaflet.Editable will delete the drawn shape if invalid