unskip gl2d data-ref annotation in supplyDefaults

Author: etpinard

src/plots/cartesian/axes.js

@@ -59,7 +59,7 @@ axes.getFromTrace = axisIds.getFromTrace;
  */
 axes.coerceRef = function(containerIn, containerOut, gd, attr, dflt, extraOption) {
     var axLetter = attr.charAt(attr.length - 1),
-        axlist = gd._fullLayout._has('gl2d') ? [] : axes.listIds(gd, axLetter),
+        axlist = axes.listIds(gd, axLetter),
         refAttr = attr + 'ref',
         attrDef = {};