revert --color=always changes

[RalfJung]

They cause problems and they completely break rendering on the playground:

   Compiling playground v0.0.1 (/playground)
    Finished dev [unoptimized + debuginfo] target(s) in 0.47s
     Running `/playground/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/cargo-miri target/miri/x86_64-unknown-linux-gnu/debug/playground`
�[0m�[1m�[38;5;9merror[E0277]�[0m�[0m�[1m: `*mut std::sync::atomic::AtomicUsize` cannot be sent between threads safely�[0m
�[0m   �[0m�[0m�[1m�[38;5;12m--> �[0m�[0msrc/main.rs:17:18�[0m
�[0m    �[0m�[0m�[1m�[38;5;12m|�[0m
�[0m�[1m�[38;5;12m17�[0m�[0m  �[0m�[0m�[1m�[38;5;12m|�[0m�[0m   �[0m�[0m        let j1 = spawn(move || {�[0m
�[0m    �[0m�[0m�[1m�[38;5;12m| �[0m�[0m �[0m�[0m�[1m�[38;5;12m__________________�[0m�[0m�[1m�[38;5;9m^^^^^�[0m�[0m�[1m�[38;5;12m_-�[0m
�[0m    �[0m�[0m�[1m�[38;5;12m| �[0m�[0m�[1m�[38;5;12m|�[0m�[0m                  �[0m�[0m�[1m�[38;5;9m|�[0m
�[0m    �[0m�[0m�[1m�[38;5;12m| �[0m�[0m�[1m�[38;5;12m|�[0m�[0m                  �[0m�[0m�[1m�[38;5;9m`*mut std::sync::atomic::AtomicUsize` cannot be sent between threads safely�[0m
�[0m�[1m�[38;5;12m18�[0m�[0m  �[0m�[0m�[1m�[38;5;12m|�[0m�[0m �[0m�[0m�[1m�[38;5;12m|�[0m�[0m �[0m�[0m            *(c.0 as *mut usize) = 32;�[0m
�[0m�[1m�[38;5;12m19�[0m�[0m  �[0m�[0m�[1m�[38;5;12m|�[0m�[0m �[0m�[0m�[1m�[38;5;12m|�[0m�[0m �[0m�[0m        });�[0m
�[0m    �[0m�[0m�[1m�[38;5;12m| �[0m�[0m�[1m�[38;5;12m|_________-�[0m�[0m �[0m�[0m�[1m�[38;5;12mwithin this `[closure@src/main.rs:17:24: 19:10]`�[0m
�[0m    �[0m�[0m�[1m�[38;5;12m|�[0m

Sorry @saethlin, I think we need to go back to start here and consider another solution.

Fixes #2277

[saethlin]

Yeah, I should probably learn how color is actually managed between cargo/rustc

[RalfJung]

@bors r+

[bors]

📌 Commit 6f7c0c0 has been approved by RalfJung

[RalfJung]

wtf. Ctrl-enter closes PRs now? I hope Github can fix this quickly...

[RalfJung]

@bors r+

[bors]

💡 This pull request was already approved, no need to approve it again.

• There's another pull request that is currently being tested, blocking this pull request: Rustup #2281

[bors]

📌 Commit 6f7c0c0 has been approved by RalfJung

[bors]

⌛ Testing commit 6f7c0c0 with merge 062b660...

[bors]

☀️ Test successful - checks-actions
Approved by: RalfJung
Pushing 062b660 to master...