Fix lint

Author: lunny

models/issue_test.go

@@ -15,10 +15,10 @@ import (
 
 	"code.gitea.io/gitea/models/db"
 	"code.gitea.io/gitea/models/foreignreference"
+	issues_model "code.gitea.io/gitea/models/issues"
 	repo_model "code.gitea.io/gitea/models/repo"
 	"code.gitea.io/gitea/models/unittest"
 	user_model "code.gitea.io/gitea/models/user"
-	issues_model "code.gitea.io/gitea/models/issues"
 
 	"github.com/stretchr/testify/assert"
 )