Remove failing UI test

Author: antoyo

tests/failing-lto-tests.txt

@@ -28,6 +28,5 @@ tests/ui/macros/macro-comma-behavior-rpass.rs
 tests/ui/macros/rfc-2011-nicer-assert-messages/assert-with-custom-errors-does-not-create-unnecessary-code.rs
 tests/ui/macros/rfc-2011-nicer-assert-messages/feature-gate-generic_assert.rs
 tests/ui/macros/stringify.rs
-tests/ui/reexport-test-harness-main.rs
 tests/ui/rfcs/rfc-1937-termination-trait/termination-trait-in-test.rs
 tests/ui/binding/fn-arg-incomplete-pattern-drop-order.rs