Forkify fixes

juno_samples/fork_join_tests/src/fork_join_tests.jn

@@ -33,7 +33,7 @@ fn test3(input : i32) -> i32[3, 3] {
   let arr2 : i32[3, 3];
   for i = 0 to 3 {
     for j = 0 to 3 {
-      arr2[i, j] = arr1[3 - i, 3 - j];
+      arr2[i, j] = arr1[2 - i, 2 - j];
     }
   }
   let arr3 : i32[3, 3];