Bug 1790816 - Reformat accessible/ with isort. r=linter-reviewers,Standard8 DONTBUILD

# ignore-this-changeset

Differential Revision: https://phabricator.services.mozilla.com/D162662

accessible/xpcom/AccEventGen.py

@@ -5,11 +5,11 @@
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 from __future__ import absolute_import
+
 import os
 
 import buildconfig
 import mozpack.path as mozpath
-
 from xpidl import xpidl
 
 # Load the webidl configuration file.