message: fix: make line chart query operate in time series mode
diff: @@ -2,5 +2,13 @@ import { buildQueryContext } from '@superset-ui/chart';
  import ChartFormData from './ChartFormData';
  export default function buildQuery(formData: ChartFormData) {
  - return buildQueryContext(formData);
  + const queryContext = buildQueryContext(formData);
  +
  + // Enforce time-series mode
  + queryContext.queries.forEach(query => {
  + const q = query;
  + q.is_timeseries = true;
  + });
  +
  + return queryContext;
  }
  