internal/gamepad: drop the inotify test, as requested in review

internal/gamepad/export_linux_test.go

@@ -23,11 +23,3 @@ const (
 	FFEffectUnionOffset  = unsafe.Offsetof(ff_effect{}.u)
 	FFEffectRumbleOffset = unsafe.Offsetof(ff_effect{}.u) + unsafe.Offsetof(ff_effect_union{}.rumble)
 )
-
-const DirName = dirName
-
-// InitNativeGamepadsForTest initializes the device-polling backend, as the first [Update] does.
-func InitNativeGamepadsForTest() error {
-	var gs gamepads
-	return newNativeGamepadsImpl().init(&gs)
-}