feat: adds Zion's PermutationDifference method in typescript to lesson_13 hw

Author: zionbuch

lesson_13/maps_ts/src/lesson13.ts

@@ -3,7 +3,7 @@
  * https://leetcode.com/problems/permutation-difference-between-two-strings
  */
 export function findPermutationDifference(s: string, t: string): number {
-      let charLocation = new Map<string, number>();
+    let charLocation = new Map<string, number>();
     let charSum = 0;
     for (let i = 0; i < s.length; i++) {
       charLocation.set(s[i], i);