Remove is_singular check for %%cf_*%% and %%parent_title%%.  I suspect t...

...his

was an optimization, but it broke functionality my site depends on. I
see other people having similar issues. It seems like this just avoids
a regex or strpos, which is nice, but since people concerned about
performance typically run a cache anyway, probably isn't worth breaking
people's sites for. This also removes the necessity of the is_admin() check.