Image filter doesn't handle DCO correctly

What’s happening: When I select the format filter “Image,” it excludes image ads that have multiple ratios (DCO) — even though most image ads are DCO. And when I select the “DCO” filter, it includes videos too.

Expected behavior: Selecting “Image” should return all image ads, including multi-ratio/DCO image ads. The “DCO” filter should not include videos.

Impact: It’s currently impossible to filter cleanly for images only (with and without multiple ratios), since the two filters overlap incorrectly. This makes image-only research unreliable.

Steps to reproduce:

1. Apply the format filter “Image” → multi-ratio (DCO) image ads are missing from results.

   Apply the format filter “DCO” → video ads incorrectly appear in results.