修复邮件发送模块不支持Qt6的BUG

control/navbutton/navbutton.h

@@ -92,11 +92,7 @@ public:
     explicit NavButton(QWidget *parent = 0);
 
 protected:
-#if (QT_VERSION >= QT_VERSION_CHECK(6,0,0))
-    void enterEvent(QEnterEvent *);
-#else
     void enterEvent(QEvent *);
-#endif
     void leaveEvent(QEvent *);
     void paintEvent(QPaintEvent *);
     void drawBg(QPainter *painter);