Removed dead code.

src/Squidex/app/framework/internal.ts

@@ -11,7 +11,6 @@ export * from './angular/animations';
 export * from './services/analytics.service';
 export * from './services/clipboard.service';
 export * from './services/dialog.service';
-export * from './services/dnd.service';
 export * from './services/local-store.service';
 export * from './services/message-bus.service';
 export * from './services/onboarding.service';