Project links should use parent link methods (#22587)

Instead of re-creating, these should use the available `Link` methods
from the "parent" of the project, which also take sub-urls into account.

Signed-off-by: jolheiser <john.olheiser@gmail.com>

models/project/project.go

@@ -123,15 +123,15 @@ func (p *Project) Link() string {
 			log.Error("LoadOwner: %v", err)
 			return ""
 		}
-		return fmt.Sprintf("/%s/-/projects/%d", p.Owner.Name, p.ID)
+		return fmt.Sprintf("%s/-/projects/%d", p.Owner.HomeLink(), p.ID)
 	}
 	if p.RepoID > 0 {
 		err := p.LoadRepo(db.DefaultContext)
 		if err != nil {
 			log.Error("LoadRepo: %v", err)
 			return ""
 		}
-		return fmt.Sprintf("/%s/projects/%d", p.Repo.RepoPath(), p.ID)
+		return fmt.Sprintf("%s/projects/%d", p.Repo.Link(), p.ID)
 	}
 	return ""
 }