tableam: Formatting and other minor cleanups.

Andres Freund <andres@anarazel.de>

Commit: 4bb50236eb561f4639e75a393a5a1c9b8681acfb
Author: Andres Freund <andres@anarazel.de>
Date: 2019-04-01T01:16:53Z
Releases: 12.0
tableam: Formatting and other minor cleanups.

The superflous heapam_xlog.h includes were reported by Peter
Geoghegan.

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