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

This reverts commit ed29089633 and
equivalent back-branch commits.  The issue is subtler than I thought,
and it's far from new, so just before a release deadline is no time
to be fooling with it.  We'll consider what to do at a bit more
leisure.

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

src/backend/rewrite/rewriteHandler.c

@@ -504,9 +504,6 @@ rewriteRuleAction(Query *parsetree,
 		 *
 		 * This could possibly be fixed by using some sort of internally
 		 * generated ID, instead of names, to link CTE RTEs to their CTEs.
-		 * However, decompiling the results would be quite confusing; note the
-		 * merge of hasRecursive flags below, which could change the apparent
-		 * semantics of such redundantly-named CTEs.
 		 */
 		foreach(lc, parsetree->cteList)
 		{
@@ -528,9 +525,6 @@ rewriteRuleAction(Query *parsetree,
 		/* OK, it's safe to combine the CTE lists */
 		sub_action->cteList = list_concat(sub_action->cteList,
 										  copyObject(parsetree->cteList));
-		/* ... and don't forget about the associated flags */
-		sub_action->hasRecursive |= parsetree->hasRecursive;
-		sub_action->hasModifyingCTE |= parsetree->hasModifyingCTE;
 	}
 
 	/*