Add Steam Deck controller mapping to database. This adds support for the back paddles, and the "..." key which are not automatically detected. * "Back" is mapped to the top left "two windows" key. * "Start" is mapped to the top right "hambuger menu" key. * "Guide" is mapped to the "Steam" key. * The "..." key is just a generic button. When looking at the screen, paddles are number * P1: Top right * P2: Top left * P3: Bottom right * P4: Botom Left The new controller mapping was created with the SDL3 gamepadmap tool. (cherry picked from commit 27b8abb0562f46e64337d5d799b877c357001254) (cherry picked from commit f4561db69a6c534e9e041f890cc06e42bdbdec4d)