Fix broken Activities link in team dashboard (go-gitea#17255)

Remove '/' suffix from organization dashboard link

Fixes go-gitea#17250

models/user.go

@@ -300,7 +300,7 @@ func (u *User) CanImportLocal() bool {
 // DashboardLink returns the user dashboard page link.
 func (u *User) DashboardLink() string {
 	if u.IsOrganization() {
-		return u.OrganisationLink() + "/dashboard/"
+		return u.OrganisationLink() + "/dashboard"
 	}
 	return setting.AppSubURL + "/"
 }