Bugfix: Clear device bad nonces when zeroing stats

miner.c

@@ -5454,6 +5454,7 @@ void zero_stats(void)
 		cgpu->utility = 0.0;
 		cgpu->utility_diff1 = 0;
 		cgpu->last_share_pool_time = 0;
+		cgpu->bad_nonces = 0;
 		cgpu->diff1 = 0;
 		cgpu->diff_accepted = 0;
 		cgpu->diff_rejected = 0;