[chore] - Remove short references as they are deprecated in later versions of Nativescript

Author: KkevinLi

demo/app/vendor-platform.android.ts

@@ -1,9 +1,9 @@
-require("application");
+require("tns-core-modules/application");
 if (!global["__snapshot"]) {
   // In case snapshot generation is enabled these modules will get into the bundle
   // but will not be required/evaluated.
   // The snapshot webpack plugin will add them to the tns-java-classes.js bundle file.
   // This way, they will be evaluated on app start as early as possible.
-  require("ui/frame");
-  require("ui/frame/activity");
+  require("tns-core-modules/ui/frame");
+  require("tns-core-modules/ui/frame/activity");
 }

demo/app/vendor.ts

@@ -1,6 +1,6 @@
 // Snapshot the ~/app.css and the theme
-const application = require("application");
-require("ui/styling/style-scope");
+const application = require("tns-core-modules/application");
+require("tns-core-modules/ui/styling/style-scope");
 const appCssContext = require.context("~/", false, /^\.\/app\.(css|scss|less|sass)$/);
 global.registerWebpackModules(appCssContext);
 application.loadAppCss();