#define XDP_WALLPAPER_TARGET_BOTH failure

Shouldn't this be the case?

```c
// old:
#define XDP_WALLPAPER_TARGET_BOTH (XDP_WALLPAPER_TARGET_BACKGROUND|XDP_WALLPAPER_TARGET_LOCKSCREEN)

//new:
#define XDP_WALLPAPER_FLAG_BOTH (XDP_WALLPAPER_FLAG_BACKGROUND|XDP_WALLPAPER_FLAG_LOCKSCREEN)
```


libportal/libportal/wallpaper.h  lines:42
