pgsql: Update additional float4/8 expected-output files.

Update additional float4/8 expected-output files.

I forgot that the back branches have more variant files than HEAD :-(.
Per buildfarm.

Discussion: https://postgr.es/m/15519-4fc785b483201ff1@postgresql.org

Branch
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REL_10_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/74587148314a71343dc92917d7a8d02925ee93e5

Modified Files
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.../regress/expected/float4-exp-three-digits.out   | 49 ++++++++++++++++++++++
.../expected/float8-exp-three-digits-win32.out     | 49 ++++++++++++++++++++++
.../regress/expected/float8-small-is-zero_1.out    | 49 ++++++++++++++++++++++
3 files changed, 147 insertions(+)