pgsql: Fix indentation in twophase.c

Fix indentation in twophase.c

This has been missed in cb0cca1, noticed before buildfarm member koel
has been able to complain while poking at a different patch.  Like the
other commit, backpatch all the way down to limit the odds of merge
conflicts.

Backpatch-through: 11

Branch
------
REL_12_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/410a0d6bdad283cc086fa05429cb53d178c62a99

Modified Files
--------------
src/backend/access/transam/twophase.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)