[Bugfix] Fix DynamicContainer.eraseItem implementation

Author: Kyle-Ye

Sources/OpenSwiftUICore/Layout/Dynamic/DynamicContainer.swift

@@ -695,9 +695,9 @@ struct DynamicContainerInfo<Adapter>: StatefulRule, AsyncAttribute, ObservedAttr
     mutating func eraseItem(at index: Int) {
         let phase = info.items[index].phase
         switch phase {
-        case .identity, nil:
+        case .willAppear, nil:
             preconditionFailure("")
-        case .willAppear:
+        case .identity:
             break
         case .didDisappear:
             info.removedCount &-= 1