tests: use absolute_import in generate-working-copy-states.py

tests/generate-working-copy-states.py

@@ -29,8 +29,10 b''
 # $ hg forget *_*_*-untracked
 # $ rm *_*_missing-*
 
+from __future__ import absolute_import
+
+import os
 import sys
-import os
 
 # Generates pairs of (filename, contents), where 'contents' is a list
 # describing the file's content at each revision (or in the working copy).

tests/test-check-py3-compat.t

@@ -144,7 +144,6 b''
   mercurial/windows.py not using absolute_import
   setup.py not using absolute_import
   tests/filterpyflakes.py requires print_function
-  tests/generate-working-copy-states.py not using absolute_import
   tests/generate-working-copy-states.py requires print_function
   tests/get-with-headers.py not using absolute_import
   tests/get-with-headers.py requires print_function