Examples: Clean up. (#21597)

examples/js/curves/NURBSUtils.js

@@ -238,7 +238,7 @@
 
 			}
 
-			const r = p;
+			let r = p;
 
 			for ( let k = 1; k <= n; ++ k ) {
 

examples/jsm/curves/NURBSUtils.js

@@ -257,7 +257,7 @@ class NURBSUtils {
 
 		}
 
-		const r = p;
+		let r = p;
 
 		for ( let k = 1; k <= n; ++ k ) {