Applied $PWD fix (changeset 278f9b13c39a) to tests/test-hook, too.

tests/test-hook

@@ -126,7 +126,7 class container:
 EOF
 
 echo '# test python hooks'
-PYTHONPATH="$PWD:$PYTHONPATH"
+PYTHONPATH="`pwd`:$PYTHONPATH"
 export PYTHONPATH
 
 echo '[hooks]' > ../a/.hg/hgrc