Use issue number/index instead of id for API URL. (#3298)
Using the API calls, the issue objects retrieved by
/repos/{owner}/{repo}/issues
contains the wrong value in the "url" field:
it uses the "id" value instead of the "number" value.
For instance, in a new repo in try.gitea.io with just one issue:
[{
"id": 896,
"url": "https://try.gitea.io/api/v1/repos/AlbertoGP/uno/issues/896",
"number": 1,
...
}]
The given URL does not work, but if you replace the "896" by "1" it
does.