remove xfail from known words again

dirk-thomas · rotu · commit 92af5f1e738a · 2019-09-19T15:54:33.000-05:00
diff --git a/test/spell_check.words b/test/spell_check.words
@@ -52,4 +52,3 @@ tuples
 unlinking
 veyor
 wildcards
-xfail
