Revert #2141 after bugfix (and update wiki)

[AureliaDolo]

Revert #2141 after rust-lang/rust#92781 is merged and the compiler bug fixed

And don't forget to update the default nightly locally too.
And maybe we should add a line about that in the doc, as currently testnet users pinned a specific nightly as default.

[damip]

Everything corrected. Just need to notify users

[AureliaDolo]

I was thinking about adding a line to make sure everyone uses the latest nightly as default I order to avoid that people that were here during the bug keep using the pinned version @Noxhaa

[Noxhaa]

I will just need to add rustup default nightly on the update tutorial. I'll do so just before the release of 6.6. Please keep me posted when you know when this will be.