Default 'expand labels' to checked in CSV advanced export

datasette/templates/table.html

@@ -145,7 +145,7 @@
             <p>
                 CSV options:
                 <label><input type="checkbox" name="_dl"> download file</label>
-                {% if expandable_columns %}<label><input type="checkbox" name="_labels"> expand labels</label>{% endif %}
+                {% if expandable_columns %}<label><input type="checkbox" name="_labels" checked> expand labels</label>{% endif %}
                 {% if next_url and config.allow_csv_stream %}<label><input type="checkbox" name="_stream"> stream all rows</label>{% endif %}
                 <input type="submit" value="Export CSV">
                 {% for key, value in url_csv_args.items() %}