message: fix(tests): fix failed e2e tab tests because of removal
diff: <tabset>
  - <tab [removable]="true" heading="Tab1">Tab1</tab>
  - <tab [removable]="true" heading="Tab2">Tab2</tab>
  + <tab heading="Tab1">Tab1</tab>
  + <tab heading="Tab2">Tab2</tab>
  </tabset>
  