Merge pull request #6408 from dataease/pr@dev@fix_line_legend_lost

fix: 折线图时间维度的图例丢失

core/frontend/src/views/chart/chart/line/line_antv.js

@@ -32,7 +32,9 @@ export function baseLineOptionAntV(plot, container, chart, action) {
   // options
   const options = {
     meta: {
-      category: 'cat'
+      category: {
+        type: 'cat'
+      }
     },
     point: {},
     theme: theme,