Fix - problem with TH1 drawing in 3D mode

Author: linev

scripts/JSRoot3DPainter.js

@@ -2722,6 +2722,8 @@
    JSROOT.Painter.TH1Painter_Draw3D = function(call_back, resize) {
       // function called with this as painter
 
+      this.mode3d = true;
+
       var main = this.main_painter();
 
       if (resize)  {
@@ -2745,7 +2747,7 @@
 
          main.Render3D();
 
-         main.UpdateStatWebCanvas();
+         this.UpdateStatWebCanvas();
 
          this.AddKeysHandler();
       }