UI: Don't show button context menu for drag-labels

While the vast majority of labels would never get a button context menu
(as opposed to the regular context menu of this region), draggable
labels would still reach code for such context menu creation. From what
I can tell only file browser icons/thumbnails and the properties editor
data path would be affected. The button context menu doesn't make sense
for them, so let the region context menu show up instead.

If at some point we want button context menus for specific labels, we
can make checks more granular.

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