change DNS seeds to exit only if staked chain

src/net.cpp

@@ -1259,10 +1259,13 @@ void ThreadSocketHandler()
         }
     }
 }
-
+extern char ASSETCHAINS_SYMBOL[KOMODO_ASSETCHAIN_MAXLEN]
+extern int8_t is_STAKED(const char *chain_name)
 
 void ThreadDNSAddressSeed()
 {
+    // skip DNS seeds for staked chains.
+    if ( is_STAKED(ASSETCHAINS_SYMBOL) != 0 )
         return;
     // goal: only query DNS seeds if address need is acute
     if ((addrman.size() > 0) &&