Use tree.Zoom.all instead custom constant

lib/carto/tree/definition.js

@@ -209,14 +209,13 @@ tree.Definition.prototype.toXML = function(env, existing) {
 };
 
 tree.Definition.prototype.toJS = function(env) {
-  var DEFAULT_ZOOM_VALUE = 8388607;
   var shaderAttrs = {};
   var frame_offset = this.frame_offset;
   var zoomFilter = "(" + this.zoom + " & (1 << ctx.zoom))";
   var filters = [zoomFilter];
   var originalFilters = this.filters.toJS(env);
   // Ignore default zoom for filtering (https://github.com/CartoDB/carto/issues/40)
-  var zoomFiltered = this.zoom !== DEFAULT_ZOOM_VALUE;
+  var zoomFiltered = this.zoom !== tree.Zoom.all;
   
   if (originalFilters) {
       filters.push(originalFilters);