Update xorm to latest version and fix correct user table referencing in sql (#4473)

vendor/github.com/go-xorm/builder/cond.go

@@ -5,7 +5,6 @@
 package builder
 
 import (
-	"bytes"
 	"io"
 )
 
@@ -19,15 +18,15 @@ var _ Writer = NewWriter()
 
 // BytesWriter implments Writer and save SQL in bytes.Buffer
 type BytesWriter struct {
-	writer *bytes.Buffer
-	buffer []byte
+	writer *StringBuilder
 	args   []interface{}
 }
 
 // NewWriter creates a new string writer
 func NewWriter() *BytesWriter {
-	w := &BytesWriter{}
-	w.writer = bytes.NewBuffer(w.buffer)
+	w := &BytesWriter{
+		writer: &StringBuilder{},
+	}
 	return w
 }