refactor(core,edges): remove default val for edge style obj

packages/core/src/components/Edges/BaseEdge.ts

@@ -23,7 +23,7 @@ const BaseEdge: FunctionalComponent<BaseEdgeProps> = function ({
 }) {
   return [
     h('path', {
-      'style': { ...style },
+      'style': style,
       'd': path,
       'class': 'vue-flow__edge-path',
       'marker-end': markerEnd,

packages/core/src/components/Edges/Wrapper.ts

@@ -179,7 +179,7 @@ const Wrapper = defineComponent({
                 labelBgBorderRadius: edge.labelBgBorderRadius,
                 data: edge.data,
                 events: { ...edge.events, ...hooks.on },
-                style: (edge.style instanceof Function ? edge.style(edge) : edge.style) || {},
+                style: edge.style instanceof Function ? edge.style(edge) : edge.style,
                 markerStart: `url(#${getMarkerId(edge.markerStart)})`,
                 markerEnd: `url(#${getMarkerId(edge.markerEnd)})`,
                 sourcePosition,