fixing the datasource inconsistence but in visualize flow (#3698)

datasource in landing explore view is not the datasource created in sal lab.

superset/assets/javascripts/SqlLab/components/VisualizeModal.jsx

@@ -151,11 +151,12 @@ class VisualizeModal extends React.PureComponent {
   }
   visualize() {
     this.props.actions.createDatasource(this.buildVizOptions(), this)
-      .done(() => {
+      .done((resp) => {
         const columns = Object.keys(this.state.columns).map(k => this.state.columns[k]);
+        const data = JSON.parse(resp);
         const mainGroupBy = columns.filter(d => d.is_dim)[0];
         const formData = {
-          datasource: this.props.datasource,
+          datasource: `${data.table_id}__table`,
           viz_type: this.state.chartType.value,
           since: '100 years ago',
           limit: '0',