Fixed metal circle render tests (#1854)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

src/mbgl/renderer/layers/render_heatmap_layer.cpp

@@ -71,6 +71,12 @@ void RenderHeatmapLayer::evaluate(const PropertyEvaluationParameters& parameters
     if (renderTarget) {
         if (auto tileLayerGroup = renderTarget->getLayerGroup(0)) {
             auto newTweaker = std::make_shared<HeatmapLayerTweaker>(getID(), evaluatedProperties);
+
+            // propertiesAsUniforms isn't recalculated every update, so carry it over
+            if (layerTweaker) {
+                newTweaker->setPropertiesAsUniforms(layerTweaker->getPropertiesAsUniforms());
+            }
+
             replaceTweaker(layerTweaker, std::move(newTweaker), {std::move(tileLayerGroup)});
         }
     }