tests: update test-releasenotes-formatting.t with new exit codes

I didn't have the fuzzywuzzy package installed before, so I didn't
notice this test fail earlier (probably when I made
`check_incompatible_arguments` return `InputError`).

Differential Revision: https://phab.mercurial-scm.org/D9514

tests/test-releasenotes-formatting.t

@@ -429,11 +429,11 b' Raise error on simultaneous usage of fla'
   $ cd relnotes-raise-error
   $ hg releasenotes -r . -l
   abort: cannot specify both --list and --rev
-  [255]
+  [10]
 
   $ hg releasenotes -l -c
   abort: cannot specify both --list and --check
-  [255]
+  [10]
 
 Display release notes for specified revs if no file is mentioned