pgsql: Quote filename in error message

Quote filename in error message

Project standard is to quote filenames in error and log messages, which
commit 2da74d8d640 missed in two error messages.

Author: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Reported-by: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Reviewed-by: Daniel Gustafsson <daniel@yesql.se>
Discussion: https://postgr.es/m/20250404.120328.103562371975971823.horikyota.ntt@gmail.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/683df3f4de00bf50b20eae92369e006badf7cd57

Modified Files
--------------
src/interfaces/libpq/fe-secure-openssl.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)