Codacy style changes for test files

test/percentile/percentile.js

@@ -1,3 +1,4 @@
 const percentile = (arr, val) =>
-(100 * arr.reduce((acc, v) => acc + (v < val ? 1 : 0) + (v === val ? 0.5 : 0), 0)) / arr.length;
+  (100 * arr.reduce((acc, v) => acc + (v < val ? 1 : 0) + (v === val ? 0.5 : 0), 0)) / arr.length;
+
 module.exports = percentile;