py3: update test expectations for py3-commands test

tests/test-py3-commands.t

@@ -75,11 +75,8 Test if log-like commands work:
 Test if `hg config` works:
 
   $ $PYTHON3 $HGBIN config
-  defaults.backout=-d "0 0"
-  defaults.commit=-d "0 0"
-  defaults.shelve=--date "0 0"
-  defaults.tag=-d "0 0"
   devel.all-warnings=true
+  devel.default-date=0 0
   largefiles.usercache=$TESTTMP/.cache/largefiles
   ui.slash=True
   ui.interactive=False