fix x11 login screen

Signed-off-by: fufesou <shuanglongchen@yeah.net>

libs/hbb_common/src/platform/linux.rs

@@ -40,6 +40,12 @@ pub fn is_desktop_wayland() -> bool {
     get_display_server() == DISPLAY_SERVER_WAYLAND
 }
 
+#[inline]
+pub fn is_x11_wayland() -> bool {
+    let ds = get_display_server();
+    ds == DISPLAY_SERVER_X11 || ds == DISPLAY_SERVER_WAYLAND
+}
+
 #[inline]
 pub fn is_x11_or_headless() -> bool {
     !is_desktop_wayland()