Update 0523-continuous-subarray-sum.js

Removing old commented code.

Author: aadil42

javascript/0523-continuous-subarray-sum.js

@@ -9,7 +9,6 @@
 var checkSubarraySum = function(arr, k) {
     let sum = 0;
     const remainderMap = new Map([ [0, -1] ]);
-    // remainderMap.set(0,-1);
 
     for(let i = 0; i < arr.length;  i++) {
         sum += arr[i];