chore: remove platform FingerId

The same as for `WindowId`.

src/platform_impl/linux/wayland/mod.rs

@@ -17,16 +17,6 @@ mod state;
 mod types;
 mod window;
 
-#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
-pub struct FingerId(i32);
-
-impl FingerId {
-    #[cfg(test)]
-    pub const fn dummy() -> Self {
-        FingerId(0)
-    }
-}
-
 /// Get the WindowId out of the surface.
 #[inline]
 fn make_wid(surface: &WlSurface) -> WindowId {