Remove const auto traits from tests

Author: lapla-cogito

tests/ui/traits/const-traits/parse-const-unsafe-trait.rs

@@ -1,4 +1,4 @@
-// Test that `const unsafe trait` and `const unsafe auto trait` works.
+// Test that `const unsafe trait` works.
 
 //@ check-pass
 
@@ -7,7 +7,5 @@
 
 pub const unsafe trait Owo {}
 const unsafe trait OwO {}
-pub const unsafe auto trait UwU {}
-const unsafe auto trait Uwu {}
 
 fn main() {}