initdb: Pad rewritten GUC lines with spaces instead of tabs.

Commit f63ae72bbc converted postgresql.conf.sample to spaces so
that it lines up at any tab width, but replace_guc_value() still
pads with tabs when it re-aligns the trailing comment of a
rewritten setting.  Fix that.

Oversight in commit f63ae72bbc.

Reviewed-by: Chao Li <[email protected]>
Discussion: https://postgr.es/m/apRezMywHRuR5h-6%40nathan
Backpatch-through: 19

Branch
------
REL_19_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/c0584c27f4f70935b3ccf31e58edb8e175fec447

Modified Files
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src/bin/initdb/initdb.c | 31 +++++--------------------------
1 file changed, 5 insertions(+), 26 deletions(-)

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