Replace second ZUIKKIS_KERNNAME for PSW_KERNNAME

Build still broken:

sgminer.c: In function âwrite_configâ:
sgminer.c:4193: error: âPSW_KERNNAMEâ undeclared (first use in this function)
sgminer.c:4193: error: (Each undeclared identifier is reported only once
sgminer.c:4193: error: for each function it appears in.)