pgsql: Fix some translatable strings in pg_basebackup and pg_combinebac

Fix some translatable strings in pg_basebackup and pg_combinebackup

Two translatable strings introduced in dc212340058b were split into two
parts, making their translation harder than necessary.

Author: Kyotaro Horiguchi
Discussion: https://postgr.es/m/20231225.134747.2287499067164862136.horikyota.ntt@gmail.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/231ff70f98e389dd510db86d3971b87e92c65d39

Modified Files
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src/bin/pg_basebackup/pg_basebackup.c       | 4 ++--
src/bin/pg_combinebackup/pg_combinebackup.c | 4 ++--
2 files changed, 4 insertions(+), 4 deletions(-)