Add float tile transition animations

src/compositor.rs

@@ -363,6 +363,7 @@ fn start_compositor2(
         animations: Default::default(),
         layout_animations_requested: Default::default(),
         layout_animations_active: Default::default(),
+        layout_animation_curve_override: Default::default(),
         suppress_animations_for_next_layout: Default::default(),
         toplevels: Default::default(),
         const_40hz_latch: Default::default(),