fix: Issues #256 fix Compare Line Chart Y unit to 'Count' done.

src/views/Discover/Performance/index.vue

@@ -206,7 +206,7 @@ export default {
      * @param { string } yUnit y 軸單位 date | count
      */
     getLineChart(chartData, content, yUnit) {
-      let datasets = setLineChartData(chartData.data, chartData.x_axis.max, chartData.x_axis.min, false, chartData.y_axis.max, chartData.y_axis.min);
+      let datasets;
       let minX = chartData.x_axis.min;
       let maxX = chartData.x_axis.max;
       let maxY = chartData.y_axis.max;