src/widgets/agenttypewidget.cpp - reduce iconsize from 64 to 32

As we've added support for more resources we've grown the height of the corresponding dialogs more than necessary. We can reduce the total widget height by shrinking the icon size. Ideally scrollbars wouldn't be shown, which then helps with the discovery of the available resource types.

(cherry picked from commit 77b0234c)

Co-authored-by: Allen Winter winter@kde.org