fix(docs-infra): correctly configure top-menu nav-item in the sidenav (#42747)

Previously, the condition for showing the top-menu nav-menu in the
sidenav was the same as that for switching the sidenav mode from docked
(`mode: side`) to floating (`mode: over`). Therefore, the `isWide` input
of the corresponding `NavMenuComponent` could be hard-coded to `false`
(since the component would only be shown when the sidenav was in
floating mode).

In 61f6ed2fdf, these two desicions were
decoupled, which would result in the top-menu nav-item being shown in
the sidenav while the sidenav is in docked mode (and thus the `isWide`
input should be set to `true`).

This commit fixes it by setting the `isWide` input based on the value of
the `dockSideNav` property, as happens for the rest of the nav-menus.

PR Close #42747

aio/src/app/app.component.html

@@ -46,7 +46,7 @@
 <mat-sidenav-container class="sidenav-container" [class.starting]="isStarting" [class.has-floating-toc]="hasFloatingToc" role="main">
 
   <mat-sidenav [ngClass]="{'collapsed': !dockSideNav}" #sidenav class="sidenav" [mode]="mode" [opened]="isOpened" (openedChange)="updateHostClasses()">
-    <aio-nav-menu *ngIf="!showTopMenu" [nodes]="topMenuNarrowNodes" [currentNode]="currentNodes?.TopBarNarrow" [isWide]="false"></aio-nav-menu>
+    <aio-nav-menu *ngIf="!showTopMenu" [nodes]="topMenuNarrowNodes" [currentNode]="currentNodes?.TopBarNarrow" [isWide]="dockSideNav"></aio-nav-menu>
     <aio-nav-menu [nodes]="sideNavNodes" [currentNode]="currentNodes?.SideNav" [isWide]="dockSideNav"></aio-nav-menu>
 
     <div class="doc-version">