Fix navigation bar issue.

Runtime/material/bottom_navigation_bar.cs

                             color: this.colorTween.evaluate(this.animation)
                         ),
                         child: new Transform(
-                            transform: Matrix3.makeAll(t, 0, 0, 0, t, 0, 0, 0, t),
+                            transform: Matrix3.makeScale(t),
                             alignment: Alignment.bottomCenter,
                             child: this.item.title
                         )