remove trailing space

Author: mubarak23

tests/failing-ui-tests.txt

@@ -29,7 +29,7 @@ tests/ui/mir/mir_drop_order.rs
 tests/ui/mir/mir_let_chains_drop_order.rs
 tests/ui/oom_unwind.rs
 tests/ui/panic-runtime/abort-link-to-unwinding-crates.rs
-tests/ui/panic-runtime/abort.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