Add reformatting to make CI happy

This kinda spurious reformatting has been reported and while somewhat
annoying not a big issue here.

Author: Leonidas-from-XIV

lib/test/mdx_test.ml

@@ -287,7 +287,7 @@ let run_exn ~non_deterministic ~silent_eval ~record_backtrace ~syntax ~silent
 
   let test_block ~ppf ~temp_file t =
     let print_block () = Block.pp ?syntax ppf t in
-    if Block.is_active ?section t then
+    if Block.is_active ?section t then (
       match Block.value t with
       | Raw _ -> print_block ()
       | Include { file_included; file_kind = Fk_ocaml { part_included } } ->
@@ -341,7 +341,7 @@ let run_exn ~non_deterministic ~silent_eval ~record_backtrace ~syntax ~silent
             ~det:(fun () ->
               assert (syntax <> Some Cram);
               Mdx_top.in_env env (fun () ->
-                  run_toplevel_tests ?syntax ?root c ppf phrases t))
+                  run_toplevel_tests ?syntax ?root c ppf phrases t)))
     else print_block ()
   in
   let gen_corrected file_contents items =