Remove outdated test.

We no longer error in this case!

Author: m-ou-se

src/tools/tidy/src/issues.txt

@@ -305,7 +305,6 @@ ui/borrowck/issue-104639-lifetime-order.rs
 ui/borrowck/issue-10876.rs
 ui/borrowck/issue-109271-pass-self-into-closure.rs
 ui/borrowck/issue-111554.rs
-ui/borrowck/issue-114374-invalid-help-fmt-args.rs
 ui/borrowck/issue-11493.rs
 ui/borrowck/issue-115259-suggest-iter-mut.rs
 ui/borrowck/issue-119915-bad-clone-suggestion.rs