Update clippy_lints/src/format_args.rs

Co-authored-by: Cameron Steffen <cam.steffen94@gmail.com>

Author: smoelius

clippy_lints/src/format_args.rs

@@ -140,7 +140,7 @@ fn check_to_string_in_format_args<'tcx>(cx: &LateContext<'tcx>, name: Symbol, ar
         if let Some(method_def_id) = cx.typeck_results().type_dependent_def_id(value.hir_id);
         if is_diag_trait_item(cx, method_def_id, sym::ToString);
         let receiver_ty = cx.typeck_results().expr_ty(receiver);
-        if let Some(display_trait_id) = get_trait_def_id(cx, &paths::DISPLAY_TRAIT);
+        if let Some(display_trait_id) = cx.tcx.get_diagnostic_item(sym::Display);
         if let Some(value_snippet) = snippet_opt(cx, value.span);
         if let Some(dot) = value_snippet.rfind('.');
         if let Some(receiver_snippet) = snippet_opt(cx, receiver.span);