Lots of problems with timedown display

[skytreader]

Couple of observations:

1. Some songs don't eat up the complete seekbar.
2. Some songs still don't end in "00:00". Check if loading new songs while in play screen has any bearing on this.

Screenshot exhibiting both observations (note that the song displayed is over):

[skytreader]

Steps to reproduce unfinished seek bar:

1. Pick two songs, a and b. Without loss of generality, let |a| > |b| in terms of play time.
2. Play a first, then b next.

Note that playing b first will result to a seek bar that ends too early.