Fix: (org-ql-view.el) Adjust priority for agenda elements

[larrasket]

Same as #325 but ready to merge

[alphapapa]

Thanks, but rather than making a new PR with the same content, all that's needed is to rebase #325 onto master, which I can do when I'm ready to merge it. Rebasing is generally preferable over merging master into a PR branch, because it avoids making a tangled commit graph.