pgsql: Merge duplicative code for \sf/\sv, \ef/\ev in psql/command.c.

Merge duplicative code for \sf/\sv, \ef/\ev in psql/command.c.

Saves ~150 lines, costs little.

Fabien Coelho, reviewed by Victor Drobny

Discussion: /messages/by-id/alpine.DEB.2.20.1703311958001.14355@lancre

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/ca4e20fde87d182aa699c5384fb1b6091f6e5f79

Modified Files
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src/bin/psql/command.c | 322 +++++++++++++------------------------------------
1 file changed, 87 insertions(+), 235 deletions(-)

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