[Scheduler] Wrong border color of the Dialog Titlebar in the popup edit form in Angular

[JoomFX]

Describe the bug
The border of the Dialog Titlebar in the Scheduler popup edit form in Angular inherits a wrong color.

To reproduce
Steps to reproduce the behavior:

1. Go to this Stackblitz example.
2. Edit one of the existing events or try to create a new event.

Expected behavior
The border should get the correct color.

Screenshots

Affected package (please remove the unneeded items)

• theme-default

Affected suites (please remove the unneeded items)

• Kendo UI for Angular

Affected browsers (please remove the unneeded items)

• All