Move ChainNameFromCommandLine into ArgsManager and rename to GetChainName

src/bitcoin-tx.cpp

@@ -44,7 +44,7 @@ static int AppInitRawTx(int argc, char* argv[])
 
     // Check for -testnet or -regtest parameter (Params() calls are only valid after this clause)
     try {
-        SelectParams(ChainNameFromCommandLine());
+        SelectParams(gArgs.GetChainName());
     } catch (const std::exception& e) {
         fprintf(stderr, "Error: %s\n", e.what());
         return EXIT_FAILURE;