egl/wayland: Use proper enum type in visual definition

No semantic change.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Tested-by: Ilia Mirkin <imirkin@alum.mit.edu>

src/egl/drivers/dri2/platform_wayland.c

@@ -67,7 +67,7 @@ enum wl_drm_format_flags {
 
 static const struct {
    const char *format_name;
-   int has_format;
+   enum wl_drm_format_flags has_format;
    unsigned int rgba_masks[4];
 } dri2_wl_visuals[] = {
    {