make writing main test easier (#27270)

This PR removed `unittest.MainTest` the second parameter
`TestOptions.GiteaRoot`. Now it detects the root directory by current
working directory.

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

services/user/user_test.go

@@ -5,7 +5,6 @@ package user
 
 import (
 	"fmt"
-	"path/filepath"
 	"strings"
 	"testing"
 
@@ -22,9 +21,7 @@ import (
 )
 
 func TestMain(m *testing.M) {
-	unittest.MainTest(m, &unittest.TestOptions{
-		GiteaRootPath: filepath.Join("..", ".."),
-	})
+	unittest.MainTest(m)
 }
 
 func TestDeleteUser(t *testing.T) {