access_output/udp: invalid check i_dts against vlc_tick_now()

Maybe once upon a time, dts is related to mdate(). But now, vlc_tick_now() and i_dts doesn't have the same start point. So such check

        i_date = vlc_tick_now() - i_date;
        if ( i_date > VLC_TICK_FROM_MS(20) )

makes a lot of noise in log output.

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