fix export module sidenav

fix private access property sidenav

lib/core/sidenav-layout/components/layout-container/layout-container.component.ts

@@ -98,7 +98,7 @@ export class LayoutContainerComponent implements OnInit, OnDestroy {
         }
     }
 
-    private get isMobileScreenSize(): boolean {
+    get isMobileScreenSize(): boolean {
         return this.mediaQueryList.matches;
     }