only grab 2d axes in lsInner

Author: etpinard

src/plot_api/subroutines.js

@@ -50,7 +50,7 @@ exports.lsInner = function(gd) {
     var fullLayout = gd._fullLayout;
     var gs = fullLayout._size;
     var pad = gs.p;
-    var axList = Axes.list(gd);
+    var axList = Axes.list(gd, '', true);
 
     // _has('cartesian') means SVG specifically, not GL2D - but GL2D
     // can still get here because it makes some of the SVG structure