Disabling anti-aliasing to get rid of Black Screen on Docker or MVs w…

…hen using OpenGL 4.5. See gazebosim/gz-sim#1116

src/plugins/minimal_scene/MinimalScene.cc

@@ -630,7 +630,7 @@ std::string GzRenderer::Initialize()
   this->dataPtr->camera->SetFarClipPlane(this->cameraFarClip);
   this->dataPtr->camera->SetImageWidth(this->textureSize.width());
   this->dataPtr->camera->SetImageHeight(this->textureSize.height());
-  this->dataPtr->camera->SetAntiAliasing(8);
+  this->dataPtr->camera->SetAntiAliasing(0);
   this->dataPtr->camera->SetHFOV(this->cameraHFOV);
   // setting the size and calling PreRender should cause the render texture to
   // be rebuilt