py3: make hgext/hgk.py use absolute_import

hgext/hgk.py

@@ -34,9 +34,21 b' Revisions context menu will now display '
 vdiff on hovered and selected revisions.
 '''
 
+from __future__ import absolute_import
+
 import os
-from mercurial import cmdutil, commands, patch, scmutil, obsolete
-from mercurial.node import nullid, nullrev, short
+from mercurial import (
+    cmdutil,
+    commands,
+    obsolete,
+    patch,
+    scmutil,
+)
+from mercurial.node import (
+    nullid,
+    nullrev,
+    short,
+)
 from mercurial.i18n import _
 
 cmdtable = {}

tests/test-check-py3-compat.t

@@ -8,7 +8,6 b''
   hgext/fsmonitor/pywatchman/capabilities.py not using absolute_import
   hgext/fsmonitor/pywatchman/pybser.py not using absolute_import
   hgext/hgcia.py not using absolute_import
-  hgext/hgk.py not using absolute_import
   hgext/highlight/__init__.py not using absolute_import
   hgext/highlight/highlight.py not using absolute_import
   hgext/histedit.py not using absolute_import