Graflow: subflow enter/exit tween aligned with tween param

bzGraflow.js

@@ -308,7 +308,7 @@ class BZgraflow extends Buildoz{
 
         // Force style flush, then animate back to identity (full parent size)
         childEl.getBoundingClientRect()
-        childEl.style.transition = 'transform 1000ms ease-in-out'
+        childEl.style.transition = `transform ${parseInt(this.getBZAttribute('tween')) || 500}ms ease-in-out`
         requestAnimationFrame(() => {
             childEl.style.top = 0;
             childEl.style.left = 0;