Fixed passing --gracetime through to slop.

[ben0x539]

No description provided.

[ben0x539]

As gcc pointed out:

main.cpp:140:53: warning: format ‘%i’ expects argument of type ‘int’, but argument 7 has type ‘char*’ [-Wformat]

This had the effect of passing the pointer's numeric value to slop, resulting in an invocation like slop -b 5 -p 0 -t 2 -g 32358608 -c 0.5,0.5,0.5,1 --min=0 --max=0

[ben0x539]

Actually this patch breaks your sprintf for pathological inputs passed to --gracetime, overflowing the slopcommand buffer.