Added missing circle style properties update

Part of #1740.

src/mbgl/style/style_layer.cpp

@@ -206,6 +206,15 @@ void StyleLayer::applyStyleProperties<LineProperties>(const float z, const TimeP
     applyStyleProperty(PropertyKey::LineWidth, line.dash_line_width, std::floor(z), TimePoint::max(), zoomHistory);
 }
 
+template <>
+void StyleLayer::applyStyleProperties<CircleProperties>(const float z, const TimePoint now, const ZoomHistory &zoomHistory) {
+    properties.set<CircleProperties>();
+    CircleProperties& circle = properties.get<CircleProperties>();
+    applyTransitionedStyleProperty(PropertyKey::CircleRadius, circle.radius, z, now, zoomHistory);
+    applyTransitionedStyleProperty(PropertyKey::CircleColor, circle.color, z, now, zoomHistory);
+    applyTransitionedStyleProperty(PropertyKey::CircleBlur, circle.blur, z, now, zoomHistory);
+}
+
 template <>
 void StyleLayer::applyStyleProperties<SymbolProperties>(const float z, const TimePoint now, const ZoomHistory &zoomHistory) {
     properties.set<SymbolProperties>();
@@ -257,6 +266,7 @@ void StyleLayer::updateProperties(float z, const TimePoint now, ZoomHistory &zoo
     switch (type) {
         case StyleLayerType::Fill: applyStyleProperties<FillProperties>(z, now, zoomHistory); break;
         case StyleLayerType::Line: applyStyleProperties<LineProperties>(z, now, zoomHistory); break;
+        case StyleLayerType::Circle: applyStyleProperties<CircleProperties>(z, now, zoomHistory); break;
         case StyleLayerType::Symbol: applyStyleProperties<SymbolProperties>(z, now, zoomHistory); break;
         case StyleLayerType::Raster: applyStyleProperties<RasterProperties>(z, now, zoomHistory); break;
         case StyleLayerType::Background: applyStyleProperties<BackgroundProperties>(z, now, zoomHistory); break;