Make the Back button more visibly selected in the default skin.
Uniformise the location of the back button across all interfaces, default and custom.
Uniformise the location of the title icon across all interfaces, default and custom.
Saved state menu overhaul.

* Show the screenshot of the selected saved state even in the creation and deletion rows.
* In the saved state deletion interface, make the single state deletion go first.
* The screenshot of the latest saved state or the last selected one appears when the menu loads.
* The screenshot of the paused game appears when the menu is left.
Default to the first non-Back option in all menus for which the element count is known to always be non-zero. That excludes the recently played games menu.