[iOS] Fix leak which could lead to two Playlist items playing at once…

… (uplift to 1.73.x) (#26624)

Uplift of #26619 (squashed) to release

ios/brave-ios/Sources/PlaylistUI/PlaylistRootView.swift

@@ -80,7 +80,7 @@ public struct PlaylistRootView: View {
     .preferredColorScheme(.dark)
     .environment(
       \.openTabURL,
-      .init { url, isPrivate in
+      .init { [delegate] url, isPrivate in
         delegate.openTabURL(url, isPrivate)
       }
     )