config_tools: bugfix for saving all enum values

fix the issue that saves all enum values are saved in scenario xml file
if user doesn't select any value in configurator.

Tracked-On: #6690
Signed-off-by: Kunhui-Li <kunhuix.li@intel.com>

misc/config_tools/configurator/packages/configurator/src/pages/Config/ConfigForm/CustomWidget/Virtio/Console.vue

@@ -137,8 +137,8 @@ export default {
         this.defaultVal = []
       }
       this.defaultVal.push({
-        "use_type": this.ConsoleUseType,
-        "backend_type": this.ConsoleBackendType,
+        "use_type": "",
+        "backend_type": "",
         "output_file_path": "",
         "sock_file_path": "",
         "tty_device_path": "",