ControlList<TItem, TOwner> caches and returns the same item for similar predicate

[YevgeniyShunevych]

When caching is disabled, ControlList<TItem, TOwner> caches and returns the same item for similar (but different) predicate.

Reported in #569 issue.

Example to reproduce

foreach (var expectedRow in table.Rows)
{
    On<DataPage>()
        .DataTable.Rows[x => x.Name.Value.Contains(expectedRow["field"])].Value1.Should.Equal(expectedRow["value1"]);