Avoid needless construction of CFX_ByteStrings during string building

xfa/fxbarcode/pdf417/BC_PDF417DetectionResultRowIndicatorColumn.cpp

Index: xfa/fxbarcode/pdf417/BC_PDF417DetectionResultRowIndicatorColumn.cpp
diff --git a/xfa/fxbarcode/pdf417/BC_PDF417DetectionResultRowIndicatorColumn.cpp b/xfa/fxbarcode/pdf417/BC_PDF417DetectionResultRowIndicatorColumn.cpp
index bdcd91052c830afd405ea50be1d1942bf3d3e735..3a6d73fd408930a3c4083534b05476381c3c1257 100644
--- a/xfa/fxbarcode/pdf417/BC_PDF417DetectionResultRowIndicatorColumn.cpp
+++ b/xfa/fxbarcode/pdf417/BC_PDF417DetectionResultRowIndicatorColumn.cpp
@@ -222,7 +222,7 @@ FX_BOOL CBC_DetectionResultRowIndicatorColumn::isLeft() {
   return m_isLeft;
 }
 CFX_ByteString CBC_DetectionResultRowIndicatorColumn::toString() {
-  return (CFX_ByteString) "IsLeft: " + (CFX_ByteString)m_isLeft + '\n' +
+  return CFX_ByteString("IsLeft: ") + m_isLeft + '\n' +
          CBC_DetectionResultColumn::toString();
 }
 void CBC_DetectionResultRowIndicatorColumn::removeIncorrectCodewords(