triagebot: Disable issue-links

This was enabled in order to encourage canonical links. Unfortunately it
seems to also create warnings for crosslinking issues [1], which is
something we definitely do want contributors to do (especially
considering how commits get cherry picked around in this repo, there may
not be a PR to easily refer to).

Disable `issue-links` for now to avoid this. This also means we lose
canonical link warnings, but there wasn't really any specific reason we
needed that anyway.

Cc: rust-lang/triagebot#1965
[1]: #4443 (comment)

Author: tgross35

triagebot.toml

@@ -11,9 +11,6 @@ allow-unauthenticated = [
 warn_non_default_branch.enable = true
 contributing_url = "https://github.com/rust-lang/libc/blob/HEAD/CONTRIBUTING.md"
 
-# Ensure issue links link to this repo
-[issue-links]
-
 # Prevents mentions in commits to avoid users being spammed
 [no-mentions]