message: Remove leftover empty button element from navbar
diff: >
  {{nav.icon (if @sidenavGutterClosed 'bars' 'times')}}
  </nav.buttons.default>
  -
  - <nav.buttons.default
  - @onclick={{@toggleOverview}}
  - local-class={{unless @metadataGutterClosed 'NonActive'}}
  - data-analytics-name='Show overview'
  - >
  - </nav.buttons.default>
  </nav.bordered-section>
  <nav.bordered-section>
  