When you double-click a preset in the preset selection screen, you only choose the preset, not use it. This is inconsistent with other selection screens (world, server, language etc).

How to reproduce:

1. Navigate to the world creation screen.
2. Change the world type to "Superflat" and click on "Customize."
3. Click on "Presets."
4. Double-click on a preset.

Expected result:

The preset would be selected and used and the game would go back to the superflat layer menu.

Observed result:

The preset is selected but not used.