Disable rustfix until original trait_duplication_in_bounds is refactored.

`trait_duplication_in_bounds` is detecting the same errors and reporting
them differently. This causes the fixed file to fail to compile.

Author: Allen Hsu

tests/compile-test.rs

@@ -397,6 +397,7 @@ const RUSTFIX_COVERAGE_KNOWN_EXCEPTIONS: &[&str] = &[
     "single_component_path_imports_nested_first.rs",
     "string_add.rs",
     "toplevel_ref_arg_non_rustfix.rs",
+    "trait_duplication_in_bounds.rs",
     "unit_arg.rs",
     "unnecessary_clone.rs",
     "unnecessary_lazy_eval_unfixable.rs",

tests/ui/trait_duplication_in_bounds.fixed

@@ -1,5 +1,3 @@
-// run-rustfix
-//
 #![deny(clippy::trait_duplication_in_bounds)]
 #![allow(unused)]