Remove no-longer-used parameter for create_groupingsets_path().

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

Commit: f172b11d616e4e440be6b3235721e283e4c16460
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2022-07-01T22:39:30Z
Releases: 16.0
Remove no-longer-used parameter for create_groupingsets_path().

numGroups is unused since commit b5635948a; let's get rid of it.

XueJing Zhao, reviewed by Richard Guo

Discussion: https://postgr.es/m/DM6PR05MB64923CC8B63A2CAF3B2E5D47B7AD9@DM6PR05MB6492.namprd05.prod.outlook.com

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