icarus: Modify work division detection packet to be compatible with Antminer U3

driver-icarus.c

@@ -484,7 +484,7 @@ int icarus_probe_work_division(const int fd, const char * const repr, struct ICA
 	unsigned char pkt[64] =
 		"\x2e\x4c\x8f\x91\xfd\x59\x5d\x2d\x7e\xa2\x0a\xaa\xcb\x64\xa2\xa0"
 		"\x43\x82\x86\x02\x77\xcf\x26\xb6\xa1\xee\x04\xc5\x6a\x5b\x50\x4a"
-		"BFGMiner Probe\0\0"
+		"WDiv\0\0\0\0BFGMiner"
 		"BFG\0\x64\x61\x01\x1a\xc9\x06\xa9\x51\xfb\x9b\x3c\x73";
 	
 	icarus_write(repr, fd, pkt, sizeof(pkt));