[frontend] export MasterPageComponent for re-use in hybrid build

frontend/src/app/master-page.module.ts

@@ -109,12 +109,9 @@ export class MasterPageRoutingModule { }
   ],
   declarations: [
     MasterPageComponent,
+  ],
+  exports: [
+    MasterPageComponent,
   ]
 })
 export class MasterPageModule { }
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