Fix issue where iOS player would stall if first click was on play button

If the first click issued by the user (on an iOS device) is on the play button, both the playbackrate tests and the `silentplay` command will be started at the same time. For some reason this makes the `silentplay` command hang and in turn the whole player. We fix this by stopping the click event from bubbling in the `LYT.player.playClickHook`