android: display: always call render_ts()

From the Android documentation:

""" if multiple buffers are sent to the Surface to be rendered at the same VSYNC, the last one will be shown, and the other ones will be dropped.

if the timestamp is not "reasonably close" to the current system time, the Surface will ignore the timestamp, and display the buffer at the earliest feasible time. In this mode it will not drop frames. """

So, if the picture date is in the past, render_ts() will display it immediately (unless a future picture with the same VSYNC is pushed just after).

If the picture date is more than 1 seconds in the future, render_ts() will behave like render().