Enable `stdin_disable_all_formatting_test` test
Enable `stdin_disable_all_formatting_test` test

Fixes: #1990.

Signed-off-by: Otavio Salvador <1d31b11c1b92bf5d043d36edfe7174db39a6b891@ossystems.com.br>

aidancully/rust,rust-lang/rustfmt,aidancully/rust,aidancully/rust,rust-lang/rustfmt,aidancully/rust,aidancully/rust,SingingTree/rustfmt,aidancully/rust,SingingTree/rustfmt,graydon/rust,graydon/rust,graydon/rust,graydon/rust,graydon/rust,graydon/rust