fix:修复清理轨迹

plugins/map_amap_ios/ios/Classes/ViewAndDataExchange/MapAmapViewAndDataExchange.swift

@@ -73,6 +73,7 @@ class MapAmapViewAndDataExchange: NSObject, ObservableObject, MapCapability {
     func handleMapClearMarkers(result: @escaping FlutterResult) {
         DispatchQueue.main.async{
             self.markers = []
+            self.polylines = []
         }
         result(nil)
     }