ISO images link to the wrong directory

[hellcp]

Describe the bug
ISO images listed on download/appliance pages link to the wrong place

To Reproduce
Steps to reproduce the behavior:

1. Go to https://software.opensuse.org/download/appliance?project=OBS:Server:2.10
2. Click on ISO, and then any of the entries
3. Discover that the file doesn't exist

Expected behavior
The link is correct and allows you to download the image

Additional context
If you have a look at the code, the links are generated in the view, and not in the controller, based on the filename only, which is the main source of this issue tbh.

[hennevogel]

More like a missing /iso/ in the url

[hellcp]

Yeah, I forgot to mention that, that being said, the links should be generated in the controller, just in case we add additional directories there.