Remove failing UI test

Author: antoyo

tests/failing-ui-tests.txt

@@ -14,7 +14,6 @@ tests/ui/panics/oom-panic-unwind.rs
 tests/ui/panic-runtime/abort-link-to-unwinding-crates.rs
 tests/ui/panic-runtime/abort.rs
 tests/ui/panic-runtime/link-to-abort.rs
-tests/ui/unwind-no-uwtable.rs
 tests/ui/parser/unclosed-delimiter-in-dep.rs
 tests/ui/consts/missing_span_in_backtrace.rs
 tests/ui/drop/dynamic-drop.rs