refactor(fuzzy-find): release the heap borrow before evicting

Comparing against the heap root inside an `if let` binding keeps the shared
borrow of `heap` alive across the `pop`/`push` in the same block. Fold the
comparison into the condition instead, so the borrow ends with the
condition expression and eviction takes a clean mutable borrow.

No behavior change.

crates/pi-natives/src/fd.rs

@@ -227,9 +227,7 @@ impl TopMatches {
 		}
 		// The root is the worst retained candidate; replace it only when the new
 		// candidate outranks it under the final comparator.
-		if let Some(worst) = self.heap.peek()
-			&& candidate < *worst
-		{
+		if self.heap.peek().is_some_and(|worst| candidate < *worst) {
 			self.heap.pop();
 			self.heap.push(candidate);
 		}