applets/quicklaunch: vertically center labels in popup

Christoph Wolkrequested to merge
cwo/kdeplasma-addons:quicklaunch_popup_center into master

Quicklaunch apps can be moved into a popup, where they use a menu-style icon-and-label presentation. But the label is top-aligned, so looks not properly aligned with the icon, like a regular menu enty/ItemDelegate would.

Instead, center them vertically.

before after
quicklaunch_delegate_before quicklaunch_delegate_after

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