Fix gui issues on high DPI monitor

Fix LineEdit widget size issues
Up-scale the icons on statusbar
Up-scale the icons in options dialog. Closes #7729.
Fix small icons in cookie manager
Fix progress bar height
Fix small icons in confirm delete dialog
Fix small icons in options dialog
Fix small images in about dialog

src/base/utils/misc.h

@@ -103,8 +103,6 @@ namespace Utils
         void openFolderSelect(const QString& absolutePath);
 
         QPoint screenCenter(const QWidget *w);
-        QSize smallIconSize();
-        QSize largeIconSize();
 #endif
 
 #ifdef Q_OS_WIN