Block prediction -> Block health - Fix wrong chart download name

frontend/src/app/lightning/nodes-networks-chart/nodes-networks-chart.component.ts

@@ -442,7 +442,7 @@ export class NodesNetworksChartComponent implements OnInit {
     download(this.chartInstance.getDataURL({
       pixelRatio: 2,
       excludeComponents: ['dataZoom'],
-    }), `block-sizes-weights-${this.timespan}-${Math.round(now.getTime() / 1000)}.svg`);
+    }), `lightning-nodes-per-network-${Math.round(now.getTime() / 1000)}.svg`);
     // @ts-ignore
     this.chartOptions.grid.bottom = prevBottom;
     this.chartOptions.backgroundColor = 'none';