CustomerTicketZoom: Ticket Info widget has too high z-index

[stefanhaerter]

The ticket information widget in CustomerTicketZoom is in front of the header due to the z-index:

Effect can be observed when creating a process ticket without an article, clicking on 'Reply' and scrolling down a bit.

Observed on rel-11_0 and rel-11_1. Putting this in the OTOBO Issues project.

[stefanhaerter]

When tackling this, please keep in mind that the display type of the widget can be controlled via the sysconfig setting Ticket::Frontend::CustomerTicketZoom###TicketInfoDisplayType from rel-11_0 onward.