feat: make the tooltip sticky in hover mode for paths

Until now, it was displayed on the path (line or polygon)
"center". So when zoomed in, if the center is not on the
screen, the tooltip will not be visible.

umap/static/umap/js/modules/rendering/ui.js

@@ -293,6 +293,11 @@ const PathMixin = {
     this.on('popupclose', this._redraw)
   },
 
+  bindTooltip: function (content, options) {
+    options.sticky = !options.permanent
+    this.parentClass.prototype.bindTooltip.call(this, content, options)
+  },
+
   highlightPath: function () {
     this.parentClass.prototype.setStyle.call(this, {
       fillOpacity: Math.sqrt(this.feature.getDynamicOption('fillOpacity', 1.0)),