Fix an oversight in two different recent patches: nodes that support SRFs

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 7028c13557067ec2cad0febcc0671551fce3190d
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2008-10-23T15:29:23Z
Releases: 8.4.0
Fix an oversight in two different recent patches: nodes that support SRFs
in their targetlists had better reset ps_TupFromTlist during ReScan calls.
There's no need to back-patch here since nodeAgg and nodeGroup didn't
even pretend to support SRFs in prior releases.

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