Fix https://github.com/go-gitea/gitea/pull/26448#issuecomment-1676194200
I accidentally set grab cursor for project columns instead of issue
cards, which actually turned out not to be a problem - with proper check
for the default column, which can't be moved.
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Co-authored-by: delvh <dev.lh@web.de>
Co-authored-by: Giteabot <teabot@gitea.io>