Function "DateTimeToStr" don't use the right DateSeparator

[Christian Peter]

Test: DateTimeToStr(now) return, per example: 06/08/2021 … . But the DateSeparator for Germany is '.'

Correct is: 06.08.2021 …

Unit “dwsDateTime”, function “TdwsDateTimeFormatter.Apply“, the parameter “settigs” has the right value for “DateSeparator”, but is not used.

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