Revert "Bugfix: SSM: Clear desired_default_share_pdiff when initialising desired_share_pdiff before authentication"

This reverts commit b4811a74d8c5e0e3dd8b02d0815048e3af181ad3.

driver-stratum.c

@@ -596,7 +596,6 @@ const char *stratumsrv_init_diff(struct cgpu_info * const proc, const char * con
 		return "Invalid difficulty";
 	
 	conn->desired_share_pdiff = nv;
-	conn->desired_default_share_pdiff = false;
 	
 	return NULL;
 }