Remove tickpadding property from gl3d axes, it is not implemented

Author: John Soklaski

src/plots/gl3d/layout/axis_defaults.js

@@ -42,6 +42,8 @@ module.exports = function supplyLayoutDefaults(layoutIn, layoutOut, options) {
                 data: options.data,
                 showGrid: true
             });
+            
+        delete containerOut.tickpadding;  //gl3d doesn't currently implement tickpadding property
 
         coerce('gridcolor');
         coerce('title', axName[0]);  // shouldn't this be on-par with 2D?