Use Qt's High-DPI scaling on Windows (#4868)

src/main.cpp

@@ -26,11 +26,6 @@ using namespace chatterino;
 
 int main(int argc, char **argv)
 {
-    // TODO: This is a temporary fix (see #4552).
-#if defined(Q_OS_WINDOWS) && QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
-    qputenv("QT_ENABLE_HIGHDPI_SCALING", "0");
-#endif
-
     QApplication a(argc, argv);
 
     QCoreApplication::setApplicationName("chatterino");