Fix can’t move anymore items in repo project boards (go-gitea#24892)

Fix go-gitea#24879
Related to go-gitea#24589

In go-gitea#24589, I changed the css, but didn't reflect the changes in
repo-level projects template.

templates/repo/projects/view.tmpl

@@ -77,7 +77,7 @@
 	</div>
 	<div class="ui container fluid padded" id="project-board">
 
-		<div class="board">
+		<div class="board {{if .CanWriteProjects}}sortable{{end}}">
 			{{range $board := .Boards}}
 
 			<div class="ui segment board-column" style="background: {{.Color}} !important;" data-id="{{.ID}}" data-sorting="{{.Sorting}}" data-url="{{$.RepoLink}}/projects/{{$.Project.ID}}/{{.ID}}">