refactor: resolve extended activity to absolute path

Author: Vasil Chimev

webpack.config.js

@@ -16,7 +16,7 @@ module.exports = env => {
     const appComponents = [
         "tns-core-modules/ui/frame",
         "tns-core-modules/ui/frame/activity",
-        "./activity.android.ts",
+        resolve(__dirname, "app/main-activity.android.ts"),
     ];
 
     const platform = env && (env.android && "android" || env.ios && "ios");