Fix warning when opening rhs (#5335)
Fix warning when opening rhs (#5335)

* Fix: `Warning: Failed prop type: Invalid prop `isCommentsPage` of
  type `string` supplied to `SearchBar`, expected `boolean`.`
rickbatka/mattermost-webapp,rickbatka/mattermost-webapp,rickbatka/mattermost-webapp,rickbatka/mattermost-webapp