Small fix for setting the DateTimeFormat of an NZazu date-Field

[wgnf]

When the Field is created, it automatically sets the DateTimeFormat that is found inside of the provided Settings, and sets the wanted enum to Custom.

But with the Functions SetProperty() --> GetConvertedValue() inside of the class PropertyExtensions the Value will be checked again and will fail most of the time, because the EnumConverter is not able to convert the DateFormatString into an Enum, and will leave the users confused as to why an error is traced, but the Field with its Formats still works (because it was set before insode of XceedDateTimeField)
This change will fix that by setting the Format-Setting to the appropriate Custom DateTimeFormat-Enum

[coveralls]

Pull Request Test Coverage Report for Build 75cr14wgwp4hqi8w

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.5%) to 80.027%

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Totals
Change from base Build 44rhw735m7y0vgny:	-0.5%
Covered Lines:	3590
Relevant Lines:	4486

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 75cr14wgwp4hqi8w

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.008%) to 80.576%

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Totals
Change from base Build 44rhw735m7y0vgny:	0.008%
Covered Lines:	3750
Relevant Lines:	4654

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💛 - Coveralls

[wgnf]

As of my understanding these errors that prevent the check from being successfull are not happening because of my changes, but are results of the refactoring of some of the Validation Mechanisms. These Commits are affected, as of my "research":

• fc74b6b
• 2036a9c

(All checks after the commit 0398757 are failing)

[mkoertgen]

Looks good. Keep up the good work! 👍