Use breeze QStyle on Windows

On Windows we want to use qqc2-desktop-style together with the Breeze QStyle instead of the default QStyle

src/main.cpp

@@ -68,6 +68,10 @@ int main(int argc, char *argv[])
     }
 #endif
 
+#if Q_OS_WINDOWS
+    QApplication::setStyle(QStringLiteral("breeze"));
+#endif
+
     QApplication::setOrganizationName("KDE");
 
     KAboutData about(QStringLiteral("neochat"), i18n("Neochat"), QStringLiteral(NEOCHAT_VERSION_STRING), i18n("Matrix client"), KAboutLicense::GPL_V3, i18n("© 2018-2020 Black Hat, 2020 KDE Community"));