screencast: Make nvidia use the GLES path

glGetTexImage returns a black image

https://forums.developer.nvidia.com/t/glgetteximage-returns-a-black-image-when-using-a-gbm-backed-egldisplay/273253

Fixes: BUG:476602

src/plugins/screencast/screencastutils.h

@@ -59,7 +59,9 @@ static void doGrabTexture(GLTexture *texture, spa_data *spa, spa_video_format fo
     }
 
     texture->bind();
-    if (GLPlatform::instance()->isGLES()) {
+    // BUG: The nvidia driver fails to glGetTexImage
+    // Drop driver() == DriverNVidia some time after that's fixed
+    if (GLPlatform::instance()->isGLES() || GLPlatform::instance()->driver() == Driver_NVidia) {
         GLFramebuffer fbo(texture);
         GLFramebuffer::pushFramebuffer(&fbo);
         glReadPixels(0, 0, size.width(), size.height(), closestGLType(format), GL_UNSIGNED_BYTE, spa->data);