Fix incorrect size of Beach theme icons
The icons had about double the required size. This caused a graphical glitch when selecting Beach and hand-drawn map.
#include <QApplication>
#include "mainform.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
MyWindow *mainWin = new MyWindow;
mainWin->show();
return app.exec();
}