Fix issue with AVPlayer rate

Model/Player/Backends/AVPlayerBackend.swift

@@ -160,7 +160,7 @@ final class AVPlayerBackend: PlayerBackend {
             return
         }
 
-        avPlayer.play()
+        avPlayer.playImmediately(atRate: Float(model.currentRate))
         model.objectWillChange.send()
     }
 
@@ -642,10 +642,15 @@ final class AVPlayerBackend: PlayerBackend {
 
             if player.timeControlStatus == .playing {
                 self.model.objectWillChange.send()
+
                 if player.rate != Float(self.model.currentRate) {
+                    if model.avPlayerUsesSystemControls {
+                        self.model.currentRate = Double(player.rate)
+                    } else {
                         player.rate = Float(self.model.currentRate)
                     }
                 }
+            }
 
             #if os(macOS)
                 if player.timeControlStatus == .playing {

Shared/Player/PlaybackSettings.swift

@@ -69,6 +69,7 @@ struct PlaybackSettings: View {
                 }
                 .padding(.vertical, 10)
 
+                if player.activeBackend == .mpv || !player.avPlayerUsesSystemControls {
                     HStack {
                         controlsHeader("Rate".localized())
                         Spacer()
@@ -84,6 +85,8 @@ struct PlaybackSettings: View {
                             #endif
                         }
                     }
+                }
+
                 if player.activeBackend == .mpv {
                     HStack {
                         controlsHeader("Captions".localized())