games/steam-sandbox: Make controllers work

The full sysfs is required for steam to discover controllers. Despite
some individual games detecting them, for full controller support
(especially in wine/proton), steam has to detect them.

users/simon/modules/games.nix

@@ -38,8 +38,6 @@ let
         --ro-bind /tmp/.X11-unix /tmp/.X11-unix
         --ro-bind "$XDG_RUNTIME_DIR/$WAYLAND_DISPLAY" "$XDG_RUNTIME_DIR/$WAYLAND_DISPLAY"
         --dev-bind /dev/dri /dev/dri
-        --ro-bind /sys/dev/char /sys/dev/char
-        --ro-bind-try /sys/devices/pci0000:00 /sys/devices/pci0000:00 # FIXME: hardcoded path for sayuri
         --ro-bind /run/opengl-driver /run/opengl-driver
         --ro-bind-try /run/opengl-driver-32 /run/opengl-driver-32
 
@@ -66,6 +64,7 @@ let
         # input
         --dev-bind /dev/input /dev/input
         --dev-bind-try /dev/uinput /dev/uinput
+        --ro-bind /sys /sys # required for discovery
       )
 
     unset SDL_VIDEODRIVER QT_QPA_PLATFORM # games generally don’t support wayland