Redo the Heightgraph patch as IIFE

patches/leaflet.heightgraph+1.3.3.patch

@@ -1,28 +1,14 @@
 diff --git a/node_modules/leaflet.heightgraph/dist/L.Control.Heightgraph.js b/node_modules/leaflet.heightgraph/dist/L.Control.Heightgraph.js
-index 122c9ac..1a966af 100644
+index 122c9ac..1048691 100644
 --- a/node_modules/leaflet.heightgraph/dist/L.Control.Heightgraph.js
 +++ b/node_modules/leaflet.heightgraph/dist/L.Control.Heightgraph.js
-@@ -1282,10 +1282,10 @@ function schedule(node, name, id, index, group, timing) {
+@@ -1,3 +1,4 @@
-     group: group, // For context during callback.
++(function() {
-     on: emptyOn,
+ 'use strict';
-     tween: emptyTween,
--    time: timing.time,
--    delay: timing.delay,
--    duration: timing.duration,
--    ease: timing.ease,
-+    time: timing ? timing.time : 0,
-+    delay: timing ? timing.delay : 0,
-+    duration: timing ? timing.duration : 0,
-+    ease: timing ? timing.ease : null,
-     timer: null,
-     state: CREATED
-   });
-@@ -3062,7 +3062,7 @@ function initRange(domain, range) {
  
- var prefix = "$";
+ function _typeof(obj) {
+@@ -5792,3 +5793,4 @@ var schemeSet3 = colors("8dd3c7ffffb3bebadafb807280b1d3fdb462b3de69fccde5d9d9d9b
  
--function Map() {}
+   return L.Control.Heightgraph;
-+// function Map() {}
+ }, window);
- 
++}());
- Map.prototype = map.prototype = {
-   constructor: Map,