tests: Don't use the initdb template for older installations

Previously the initdb template was used even when creating a Cluster.pm
instance for an old install. Obviously the current template is not right for
that case.  The only reason we didn't notice before is because the existing
cross-version tests, e.g. 002_pg_upgrade.pl, always pass initdb options for
the old node.

Oversight in 252dcb32397.

Discussion: 
https://postgr.es/m/xhzif5hemvslxymzhk3ykdypwqvjm7pz5dm7taizgxgfjw6fwa@6gygmz5bdnc3
Backpatch-through: 17

Branch
------
REL_18_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/19a2002b5db959e095926d74d46be4b8aa7f20a2

Modified Files
--------------
src/test/perl/PostgreSQL/Test/Cluster.pm | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

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