scheduleCheck - update tests

[stocktons]

add a test in practice problems part 2 to check for

let schedule1 = {
  Tuesday: true,
  Wednesday: false,
};
let schedule2 = {
  Tuesday: true,
  Wednesday: false,
};

not returning 2 - it should be 0 since we only want keys that are true to be counted (our solution is correct, but the tests won’t catch this case for students right now)