lang agenda generator ignores lang-nominated closed issues

[pnkfelix]

If someone tags a closed issue (specifically, a merged PR) as I-lang-nominated, it does not get picked up by our current meeting agenda generator.

See for example: rust-lang/rust#106323

[apiraino]

Relevant code in the lang agenda generator of the triagebot

[joshtriplett]

I had the impression this was intentional (so that we could close issues without having to un-nominate them), but no objection to changing it if folks want to bring closed things to our attention.

[joshtriplett]

We seem to have a rough consensus in favor of doing this; let's go ahead and make this change to the agenda generator.

[apiraino]

Note: removing that flag will pull any old I-lang-nominated (likely already discussed) from these repositories:

("rust-lang", "rfcs"),
("rust-lang", "rust"),
("rust-lang", "reference"),
("rust-lang", "lang-team"),
("rust-lang", "compiler-team")

so probably a cleanup of I-lang-nominated from old issues will help :-)