[Bug] Download button downloads the wrong file

[hitchclimber]

If you use the download button in the top right hand corner while viewing pictures in the gallery, it will download the picture that was clicked on to get into the view.

To Reproduce

1. Go to 'Gallery'
2. Click on any picture
3. While on this view, click the arrow key to navigate to any other picture
4. Click 'Download'. It will download the picture you selected in step 2

Expected behavior

It shoud download the picture you're currently viewing, not the one that got you into the view mode in the first place.

Desktop (please complete the following information):

 - OS: Ubuntu 22.04 LTS
 - Browser [Firefox
 - Version 0.4.15

I'd actually like to help (I'm a web dev) but I've never done anything in Go, so don't know whether any one would have time to babysit me...