`fig-cap-location` only works in 1.4 for crossref figures

[cderv]

---
title: "Test"
format:
  html:
    fig-cap-location: margin
---

![Test figure caption](https://placeholder.co/400)

With 1.3

This is a regression.

I believe this is linked to other due to FloatRefTarget change I believe as we know consider figures only where there is a #fig- id. (cc @cscheid)

I don't know where we are on this topic, as I can't find related issues but I am sure we have other related to how we consider figure in 1.4

Adding the id fixed it

---
title: "Test"
format:
  html:
    fig-cap-location: margin
---

![Test figure caption](https://placeholder.co/400){#fig-dummy}

Found in #8058