fix: iOS chapter sleep timer issues

ios/App/Shared/player/AudioPlayer.swift

@@ -194,11 +194,6 @@ class AudioPlayer: NSObject {
                 if self.isSleepTimerSet() {
                     // Update the UI
                     NotificationCenter.default.post(name: NSNotification.Name(PlayerEvents.sleepSet.rawValue), object: nil)
-                    
-                    // Handle a sitation where the user skips past the chapter end
-                    if self.isChapterSleepTimerBeforeTime(currentTime) {
-                        self.removeSleepTimer()
-                    }
                 }
             }
         }
@@ -352,6 +347,9 @@ class AudioPlayer: NSObject {
         
         // Update the progress
         self.updateNowPlaying()
+        
+        // Handle a chapter sleep timer that may now be invalid
+        self.handleTrackChangeForChapterSleepTimer()
     }
     
     public func pause() {