"Show all columns" cog menu item should show if ?_col= is used #1341
Description
On https://latest.datasette.io/fixtures/sortable?_col=sortable the "Show all columns" item (from #615) is not shown (it should be):
{{ message }}
On https://latest.datasette.io/fixtures/sortable?_col=sortable the "Show all columns" item (from #615) is not shown (it should be):