fix(dashboard): make chart line areas not transparent

src/app/pages/dashboard/electricity/electricity-chart/electricity-chart.component.ts

@@ -152,6 +152,7 @@ export class ElectricityChartComponent implements AfterViewInit {
                     offset: 1,
                     color: eTheme.areaGradTo,
                   }]),
+                  opacity: 1,
                 },
               },
               data: this.data.map(i => i.value),

src/app/pages/dashboard/traffic/traffic-chart.component.ts

@@ -132,6 +132,7 @@ export class TrafficChartComponent implements AfterViewInit {
                   offset: 1,
                   color: trafficTheme.gradTo,
                 }]),
+                opacity: 1,
               },
             },
             data: points,