Update Android Auto playback speed string

android/app/src/main/java/com/audiobookshelf/app/player/PlayerNotificationService.kt

@@ -1201,7 +1201,7 @@ class PlayerNotificationService : MediaBrowserServiceCompat()  {
       customActionExtras.putFloat("speed", playbackRate)
       return PlaybackStateCompat.CustomAction.Builder(
         CUSTOM_ACTION_CHANGE_SPEED,
-        getContext().getString(R.string.action_skip_backward),
+        getContext().getString(R.string.action_change_speed),
         drawable
       )
         .setExtras(customActionExtras)

android/app/src/main/res/values/strings.xml

@@ -10,4 +10,5 @@
     <string name="action_jump_backward">Jump Backward</string>
     <string name="action_skip_forward">Skip Forward</string>
     <string name="action_skip_backward">Skip Backward</string>
+    <string name="action_change_speed">Change Playback Speed</string>
 </resources>