Don't display seconds in countdown label

[Kirr]

There is an option to show the countdown label. Seconds on the label could be distracting, annoying, superfluous. I suggest adding an option to change the format of countdown label to "hh:mm" (where "hh" stands for remaining hours and "mm" is remaining minutes)

[Kirr (harakesh557)]

In case if someone wants this, I changed line 229 in ui.c:

tmp = g_strdup_printf("%02d:%02d:%02d", tm->tm_hour, tm->tm_min, tm->tm_sec);

to:

tmp = g_strdup_printf("%d:%02d", tm->tm_hour, tm->tm_min);

It corresponds to format "h:mm".