py3: use absolute_import in test-hybridencode.py

tests/test-check-py3-compat.t

@@ -57,7 +57,6 b''
   tests/test-demandimport.py requires print_function
   tests/test-doctest.py not using absolute_import
   tests/test-hgwebdir-paths.py not using absolute_import
-  tests/test-hybridencode.py not using absolute_import
   tests/test-hybridencode.py requires print_function
   tests/test-lrucachedict.py not using absolute_import
   tests/test-lrucachedict.py requires print_function

tests/test-hybridencode.py

@@ -1,4 +1,7 b''
-from mercurial import store
+from __future__ import absolute_import
+from mercurial import (
+    store,
+)
 
 def show(s):
     # show test input