test: fix missed warning for non-experimental AbortController

Signed-off-by: James M Snell <[email protected]>

PR-URL: #36240
Reviewed-By: Antoine du Hamel <[email protected]>
Reviewed-By: Michael Dawson <[email protected]>
Reviewed-By: Shelley Vohr <[email protected]>
Reviewed-By: Rich Trott <[email protected]>

Author: jasnell

test/parallel/test-eventtarget-memoryleakwarning.js

@@ -25,10 +25,6 @@ common.expectWarning({
      'Use events.setMaxListeners() to increase ' +
      'limit'],
   ],
-  ExperimentalWarning: [[
-    'AbortController is an experimental feature. This feature could change ' +
-    'at any time'
-  ]]
 });