Remove hard-coded updatemenus active default

Author: rreusser

src/components/updatemenus/defaults.js

@@ -50,9 +50,7 @@ function menuDefaults(menuIn, menuOut, layoutOut) {
     var visible = coerce('visible', buttons.length > 0);
     if(!visible) return;
 
-    // Default to zero since active must be *something*:
-    coerce('active', 0);
-
+    coerce('active');
     coerce('direction');
     coerce('type');
     coerce('showactive');