build: update to angular-v9.1.12 (#1215)

Fixes: #1216

src/app/core/route/route-reusable-strategy.ts

@@ -1,11 +1,13 @@
 /** Angular Imports */
 import { ActivatedRouteSnapshot, DetachedRouteHandle, RouteReuseStrategy } from '@angular/router';
+import { Injectable } from '@angular/core';
 
 /**
  * A route strategy allowing for explicit route reuse.
  * Used as a workaround for https://github.com/angular/angular/issues/18374
  * To reuse a given route, add `data: { reuse: true }` to the route definition.
  */
+@Injectable()
 export class RouteReusableStrategy extends RouteReuseStrategy {
 
   public shouldDetach(route: ActivatedRouteSnapshot): boolean {