ADS: Fix workspace dialog on removal

- Fix an issue where the list of workspaces is not correctly updated
  after removal of a workspace in the dialog
- Fix initial sorting of the workspace model

Change-Id: I0c16aabc1fdcc2690fcb83e40b0d5d16cb6c72ba
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

src/libs/advanceddockingsystem/workspacemodel.cpp

@@ -53,6 +53,7 @@ WorkspaceModel::WorkspaceModel(DockManager *manager, QObject *parent)
     , m_currentSortColumn(0)
 {
     m_sortedWorkspaces = m_manager->workspaces();
+    sort(m_currentSortColumn, m_currentSortOrder);
     connect(m_manager, &DockManager::workspaceLoaded, this, &WorkspaceModel::resetWorkspaces);
 }