Enable broken color in MSYS2 shells

Signed-off-by: 二手掉包工程师 <rustin.liu@gmail.com>

Author: 0xPoe

src/utils/tty.rs

@@ -28,11 +28,6 @@ fn isatty(fd: libc::c_int) -> bool {
 #[inline]
 #[cfg(windows)]
 fn isatty(fd: winapi::shared::minwindef::DWORD) -> bool {
-    if std::env::var("MSYSTEM").is_ok() {
-        // FIXME: No color is better than broken color codes in MSYS shells
-        //        https://github.com/rust-lang/rustup/issues/2292
-        return false;
-    }
     use winapi::um::{consoleapi::GetConsoleMode, processenv::GetStdHandle};
     unsafe {
         let handle = GetStdHandle(fd);