Fix clippy suggesting to do something weird

rs/src/ui.rs

@@ -46,8 +46,9 @@ impl std::fmt::Display for board::Position {
 
 impl std::fmt::Display for board::Board {
     fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
-        Ok(for (position, piece) in self.iter() {
+        for (position, piece) in self.iter() {
-            write!(f, "{}{}", piece, position)?
+            write!(f, "{}{}", piece, position)?;
-        })
+        }
+        Ok(())
     }
 }