Removal of unnecessary code for JS problem 74

Author: imaginate

javascript/74-Search-A-2D-Matrix.js

@@ -13,7 +13,7 @@ function searchMatrix(matrix, target) {
     const width = matrix[0].length;
     const height = matrix.length;
     let i = 0;
-    let j = (height - 1) * width + width - 1;
+    let j = height * width - 1;
 
     while (i <= j) {
         const m = Math.floor((i + j) / 2);
@@ -91,4 +91,4 @@ function searchMatrix(matrix, target) {
  */
 function top(arr) {
     return arr[arr.length - 1];
-}
+}