decred: keep first protocol without the vote arg

argh... suprnova again...

ccminer.cpp

@@ -859,7 +859,7 @@ static bool submit_upstream_work(CURL *curl, struct work *work)
 			applog(LOG_DEBUG, "share diff: %.5f (x %.1f)",
 				stratum.sharediff, work->shareratio);
 
-		if (nvote) { // ALGO_HEAVY ALGO_DECRED
+		if (opt_vote) { // ALGO_HEAVY ALGO_DECRED
 			nvotestr = bin2hex((const uchar*)(&nvote), 2);
 			sprintf(s, "{\"method\": \"mining.submit\", \"params\": ["
 					"\"%s\", \"%s\", \"%s\", \"%s\", \"%s\", \"%s\"], \"id\":4}",