fix(datepicker): not showing single-day comparison ranges #20102
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The logic that determines whether we show something as being a range doesn't allow for the start and end to be on the same date, because it increases the CSS complexity a lot. As a result, we aren't able to render ranges that start and end on the same day. This isn't a problem for the main range, because we style its start and end as selected which looks exactly the same as the start/end of a range, however it breaks down for the comparison range since it doesn't have the same selected styling for its start/end cells.
These changes fix the issue by introducing a special class for the case where the comparison range is for a single day. While it's not ideal, it's preferrable to complicating the CSS for the range styling.
Fixes #20100.