feat: change default time range in sql lab explore

Change from "100 years go" to "no filter".

100 years ago is basically equivalent to no filter, but has
implications on how x-axis is plotted on certain charts (e.g. Big
Number).

superset-frontend/src/SqlLab/components/ExploreResultsButton.jsx

@@ -139,8 +139,8 @@ class ExploreResultsButton extends React.PureComponent {
           datasource: `${data.table_id}__table`,
           metrics: [],
           groupby: [],
+          time_range: 'No filter',
           viz_type: 'table',
-          since: '100 years ago',
           all_columns: columns.map(c => c.name),
           row_limit: 1000,
         };