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

Fixes: #1216

src/app/core/shell/sidenav/sidenav.component.ts

@@ -121,7 +121,9 @@ export class SidenavComponent implements OnInit {
    */
   pushActivity(path: string) {
     const activity = this.frequentActivities.find((entry: any) => entry.path === path);
-    this.mappedActivities.push(activity);
+    if (!this.mappedActivities.includes(activity)) {
+      this.mappedActivities.push(activity);
+    }
   }
 
 }

src/app/core/shell/toolbar/toolbar.component.ts

@@ -1,6 +1,7 @@
 /** Angular Imports */
 import { Component, OnInit, Input, EventEmitter, Output } from '@angular/core';
-import { MatSidenav, MatDialog } from '@angular/material';
+import { MatDialog } from '@angular/material/dialog';
+import { MatSidenav } from '@angular/material/sidenav';
 import { BreakpointObserver, Breakpoints } from '@angular/cdk/layout';
 import { Router } from '@angular/router';