Revert back to module.exports in Forge config.

Looks like Forge doesn't support default exports anymore, if it ever
supported it before.

Author: SpacingBat3

Diff for: sources/code/build/forge.ts

@@ -274,4 +274,4 @@ const config:ForgeConfig = {
 };
 
 /* eslint-disable-next-line import/no-unused-modules *//* Module entry point */
-export default config;
+module.exports = config;