fix: remove duplicate line (#79)

Author: jpoehnelt

src/markerclusterer.ts

@@ -209,7 +209,6 @@ export class MarkerClusterer extends OverlayViewSafe {
   }
 
   protected reset(): void {
-    this.markers.forEach((marker) => marker.setMap(null));
     this.markers.forEach((marker) => marker.setMap(null));
     this.clusters.forEach((cluster) => cluster.delete());
     this.clusters = [];