app_server was not storing its settings when the workspace count was changed.

As a consequence this setting was lost unless another setting was also altered
that affected the workspace configuration in some way.
Fixes #2849.



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@28206 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/servers/app/DesktopSettings.cpp

@@ -508,6 +508,7 @@ DesktopSettingsPrivate::SetWorkspacesCount(int32 number)
 		number = kMaxWorkspaces;
 
 	fWorkspacesCount = number;
+	Save(kWorkspacesSettings);
 }