adwaita: fix selectionmode checkboxes

Jakub Steinerrequested to merge
wip/jimmac/issue-28 into gtk-3-22
  • stop usingimage assets
  • FIXME: sadly despite being scalable, the overlay checkmark is not rendered to the target 32x32px size, but the 16x16px buffer seems to be scaled up.

Fixes issue #28 (closed)

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