message: [storage] rename should_exist to should_exist_vec in schemadb test
  Closes:
  Approved by: davidiw
diff: @@ -166,15 +166,15 @@ proptest! {
  for i in 0..100u32 {
  db.put::<TestSchema1>(&TestField(i), &TestField(i)).unwrap();
  }
  - let mut should_exist = [true; 100];
  + let mut should_exist_vec = [true; 100];
  for (begin, end) in ranges_to_delete {
  db.range_delete::<TestSchema1, TestField>(&TestField(begin), &TestField(end)).unwrap();
  for i in begin..end {
  - should_exist[i as usize] = false;
  + should_exist_vec[i as usize] = false;
  }
  }
  - for (i, should_exist) in should_exist.iter().enumerate() {
  + for (i, should_exist) in should_exist_vec.iter().enumerate() {
  assert_eq!(
  db.get::<TestSchema1>(&TestField(i as u32)).unwrap().is_some(),
  *should_exist,
  