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 61f6ed2fdfe58679cfada861624c759f1572a430, 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
19bcdfb028