Fix infinite recursion in WindowId conversion methods

src/window.rs

@@ -85,13 +85,13 @@ impl WindowId {
 
 impl From<WindowId> for u64 {
     fn from(window_id: WindowId) -> Self {
-        window_id.into()
+        window_id.0.into()
     }
 }
 
 impl From<u64> for WindowId {
     fn from(raw_id: u64) -> Self {
-        raw_id.into()
+        Self(raw_id.into())
     }
 }