Fixes bug where seconds per day value was wrong

In EpicTimer.pas I discovered what I think is a
bug - but it seems so obvious that I am puzzled no one should have seen it
until now.

On line 539 (function ElapsedDHMS) you are calculating the days incorrect -
the seconds per day are 86400 and not 84600.

Kind regards,
Jens

Signed-off-by: Graeme Geldenhuys <graemeg@gmail.com>