Fix: (ancestors, parent) Normalize sub-queries

I'm not sure why calling the REC labeled function didn't correctly
normalize these sub-queries; it seemed to only normalize for one
round, leaving some queries incorrectly normalized.  But this fixes
it.

Fixes #365.

Reported-by: Gabriele Mongiano <https://github.com/kofm>

org-ql.info

@@ -1082,6 +1082,10 @@ File: README.info,  Node: 085-pre,  Next: 084,  Up: Changelog
      discussion (https://github.com/alphapapa/org-ql/discussions/410).
      Thanks to Alex Popescu (https://github.com/al3xandru) for
      reporting.)
+   • Predicates ‘ancestor’ and ‘parent’ did not normalize their
+     sub-queries, sometimes returning incorrect results.  (#365
+     (https://github.com/alphapapa/org-ql/issues/365).  Thanks to
+     Gabriele Mongiano (https://github.com/kofm) for reporting.)
 
 
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