pgsql: Propagate CTE property flags when copying a CTE list into a rule

Propagate CTE property flags when copying a CTE list into a rule.

rewriteRuleAction() neglected this step, although it was careful to
propagate other similar flags such as hasSubLinks or hasRowSecurity.
Omitting to transfer hasRecursive is just cosmetic at the moment,
but omitting hasModifyingCTE is a live bug, since the executor
certainly looks at that.

The proposed test case only fails back to v10, but since the executor
examines hasModifyingCTE in 9.x as well, I suspect that a test case
could be devised that fails in older branches.  Given the nearness
of the release deadline, though, I'm not going to spend time looking
for a better test.

Report and patch by Greg Nancarrow, cosmetic changes by me

Discussion: https://postgr.es/m/CAJcOf-fAdj=nDKMsRhQzndm-O13NY4dL6xGcEvdX5Xvbbi0V7g@mail.gmail.com

Branch
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REL_10_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/56ff63cac94df2979ee7173c4b612db8f81492ae

Modified Files
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src/backend/rewrite/rewriteHandler.c |  6 ++++++
src/test/regress/expected/with.out   | 27 +++++++++++++++++++++++++++
src/test/regress/sql/with.sql        | 16 ++++++++++++++++
3 files changed, 49 insertions(+)