Refactor some clippy-pedantic errors

src/board/state.rs

@@ -62,8 +62,9 @@ impl State {
         self.update_castling_state_capture(src, color);
 
         match (src, color) {
-            (4, Color::White) => self.set_castling_ability(color, Castle::None),
-            (60, Color::Black) => self.set_castling_ability(color, Castle::None),
+            (4, Color::White) | (60, Color::Black) => {
+                self.set_castling_ability(color, Castle::None)
+            }
             _ => (),
         }
     }