increase opt_statavg from 30secs to 5mins

help average out hash-rate takes stats average for hash-rate over 5 mins instead of default 30 seconds

ccminer.cpp

@@ -219,7 +219,7 @@ double opt_resume_temp = 0.;
 double opt_resume_diff = 0.;
 double opt_resume_rate = -1.;
 
-int opt_statsavg = 30;
+int opt_statsavg = 300;
 
 bool opt_eco_mode = false;
 bool allow_getwork = true;