Fixing Bug for field fuzz not sleeping

Conditional logic was causing the sleep code from
ever being called by prematurely returning.  I updated
the code to do exactly what the header fuzz function
does in this scenario as a fix for this bug.
If I understand all of this code correctly, this isn't correct.  Yes, elsewhere (line ~204), @fuzzsize is incremented by 2, but that isn't right.  Unless 2 is some sort of magic number that this code uses in a special way, any time the fuzzsize is incremented it should increment by ```datastore['STEPSIZE']```