chore: update tns-core-modules short imports to full imports

Author: VladimirAmiorkov

demo/app/home-page.ts

@@ -1,5 +1,5 @@
-import { EventData } from 'data/observable';
-import { Page } from 'ui/page';
+import { EventData } from 'tns-core-modules/data/observable';
+import { Page } from 'tns-core-modules/ui/page';
 import { HomeViewModel } from './home-view-model';
 
 // Event handler for Page 'loaded' event attached in main-page.xml

demo/app/login-page.ts

@@ -1,5 +1,5 @@
-import { EventData } from 'data/observable';
-import { Page } from 'ui/page';
+import { EventData } from 'tns-core-modules/data/observable';
+import { Page } from 'tns-core-modules/ui/page';
 import { LoginViewModel } from './login-view-model';
 
 // Event handler for Page 'loaded' event attached in main-page.xml