[NuGet] Use existing consolidate label for projects list view

Instead of using new text for the accessibility label for the projects
and versions list view re-use the existing consolidate label.

Author: mrward

main/src/addins/MonoDevelop.PackageManagement/MonoDevelop.PackageManagement.Gui/ManagePackagesDialog.cs

@@ -240,7 +240,7 @@ void InitializeProjectsListView ()
 
 			projectsListView = new ListView ();
 			projectsListView.DataSource = projectStore;
-			projectsListView.Accessible.Label = GettextCatalog.GetString ("Projects and Package Versions");
+			projectsListView.Accessible.LabelWidget = projectsListViewLabel;
 
 			// Selected project check box column.
 			if (projectCheckBoxCellView != null)