Use EGL+GLES workaround for Nvidia X11

We can avoid disabling EGL entirely by forcing Qt to use GLES,
which is not impacted by the black window issue. This lets us
simplify back to EGL everywhere.

app/streaming/video/ffmpeg-renderers/eglvid.cpp

@@ -426,13 +426,6 @@ bool EGLRenderer::initialize(PDECODER_PARAMETERS params)
         return false;
     }
 
-    // If we're using X11 GLX (both in SDL and Qt), don't use this renderer.
-    // Switching between EGL and GLX can cause interoperability issues.
-    if (strcmp(SDL_GetCurrentVideoDriver(), "x11") == 0 && !WMUtils::isX11EGLSafe()) {
-        EGL_LOG(Warn, "Disabled due to use of GLX");
-        return false;
-    }
-
     // This hint will ensure we use EGL to retrieve our GL context,
     // even on X11 where that is not the default. EGL is required
     // to avoid a crash in Mesa.