CustomDateFormat Plugin: Hours always undefined

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Prerequisites

• I have searched for duplicate or closed issues.
• I have validated my setup against the latest version on StackBlitz.
• I have read the contributing guidelines.

Describe the issue

After update from 6.2.7 to 6.2.8 the hours are always undefined.

StackBlitz fork

https://stackblitz.com/edit/tempus-dominus-v6-simple-setup-import-vsrvmt?file=index.js

What operating system(s) are you seeing the problem on?

Windows

What browser(s) are you seeing the problem on?

Chrome

What version of are you using? You can find this information from the sample StackBlitz.

6.2.8

What your browser's locale? You can find this information from the sample StackBlitz.

de-DE

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@Eonasdan I think it was a regression from 3de5da3
The hoursFormatted and twelveHoursFormatted methods of the DateTime was removed but is used in the CustomDateFormat plugin.

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I created a PR with a fix #2742