Ignore other flags after pro is enabled since we won't understand them

Former-commit-id: 049b48ef79fdde4c9b1c9f227a329bd9223e2b1d

src/config.cpp

@@ -804,6 +804,7 @@ void loadServerConfigFromString(char *config) {
             // NOP, handled in main
         } else if (!strcasecmp(argv[0],"enable-pro")) {
             cserver.fUsePro = true;
+            break;
         } else {
             err = "Bad directive or wrong number of arguments"; goto loaderr;
         }