fix: corrects return statement formatting in Lesson13 class

Author: nia-source

lesson_13/maps_java/maps_app/src/main/java/com/codedifferently/lesson13/Lesson13.java

@@ -15,7 +15,7 @@ public int findPermutationDifference(String s, String t) {
       if (index != -1) {
         answer += Math.abs(i - index);
       }
-      return answer;`````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````
-        
-    })
+    }
+    return answer;
   }
+}