Avoid EGL_BAD_MATCH in tst_qrhi autotest

Call adjustedFormat() as advised by the docs: "Applications are advised
to set this format on their QWindow in order to avoid potential BAD_MATCH
failures."

Task-number: QTBUG-79659
Change-Id: Ibf415fb0ee64bdd3f01d4ba744244bce811c0d27
Reviewed-by: Paul Olav Tvete <paul.tvete@qt.io>

tests/auto/gui/rhi/qrhi/tst_qrhi.cpp

@@ -1590,6 +1590,9 @@ void tst_QRhi::renderToWindowSimple()
     QScopedPointer<QWindow> window(new QWindow);
     switch (impl) {
     case QRhi::OpenGLES2:
+#if QT_CONFIG(opengl)
+        window->setFormat(QRhiGles2InitParams::adjustedFormat());
+#endif
         Q_FALLTHROUGH();
     case QRhi::D3D11:
         window->setSurfaceType(QSurface::OpenGLSurface);