resize tray icon because a 1024x1024 icon won't show in ubuntu (bug)

src/qt/networkstyle.h

@@ -18,6 +18,7 @@ public:
 
     const QString &getAppName() const { return appName; }
     const QIcon &getAppIcon() const { return appIcon; }
+    const QIcon &getTrayAndWindowIcon() const { return trayAndWindowIcon; }
     const QString &getTitleAddText() const { return titleAddText; }
 
 private:
@@ -25,6 +26,7 @@ private:
 
     QString appName;
     QIcon appIcon;
+    QIcon trayAndWindowIcon;
     QString titleAddText;
 };