redirect to correct site after applying draft

[i-just]

Description

Fixes redirect issue in the following case:

• you have at least 2 sites
• you have a section enabled for both sites, with the propagation method set to custom (“Let each entry choose which sites it should be saved to”)
• you create an entry for site1
• you edit that entry and enable it for site2
• without saving the provisional draft, you switch to site2, and there you save & continue editing (apply draft)

In the above case, the draft would be applied, but you’d be redirected to the entry on site1. This PR ensures you stay in the entry on site2.

Related issues

N/A