Remove now-unnecessary Autovacuum[Launcher|Worker]IAm functions

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: e7c6efe305afff030b50fe6f792af48deff5cf3e
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2023-12-04T13:34:37Z
Releases: 17.0
Remove now-unnecessary Autovacuum[Launcher|Worker]IAm functions

After commit fd5e8b440d, InitProcess() is called later in the
EXEC_BACKEND startup sequence, so it's enough to set the
am_autovacuum_[launcher|worker] variables at the same place as in the
!EXEC_BACKEND case.

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