library: TopAppBar: Fix velocity return value

* When the animation operation is reversed

Author: YuKongA

miuix/src/commonMain/kotlin/top/yukonga/miuix/kmp/basic/TopAppBar.kt

@@ -516,9 +516,9 @@ private suspend fun settleAppBar(
             ) {
                 state.heightOffset = value
             }
+            return Velocity(0f, velocity)
         }
     }
-
     return Velocity(0f, velocity - remainingVelocity)
 }