Need to reset local buffer pin counts, not only shared buffer pins,

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

Commit: 817bc021b76a8d34a8947be5ff037b27778c651f
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2005-03-18T16:16:20Z
Releases: 8.0.2
Need to reset local buffer pin counts, not only shared buffer pins,
before we attempt any file deletions in ShutdownPostgres.  Per Tatsuo.

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