Fix Uptime Statistics

If uptime is 51 seconds, displayed statistics are: 1min 51seconds. This is
because [((51/60) % 60) = 0.85], which rounds upto 1. This error is rectified
by replacing round() with floor().

Signed-off-by: Nehal J Wani <nehaljw.kkd1@gmail.com>
Signed-off-by: Pekka Enberg <penberg@iki.fi>