[Bug] "Xbox" button doesn't open SteamDeck UI overlay

[MateyBoi]

User story
[As a] gamer
[I want] to open the SteamDeck UI when playing games
[So that] I can access contextual controls

User Acceptance Criteria
[Given] a game is running
[Then] open the SteamDeck UI overlay
[When] the OXP "Xbox" button is pressed (long press)