Fix STRICT check for strict aggregates with NULL ORDER BY columns.

I (Andres) broke this unintentionally in 69c3936a14, by checking
strictness for all input expressions computed for an aggregate, rather
than just the input for the aggregate transition function.

Reported-By: Ondřej Bouda
Bisected-By: Tom Lane
Diagnosed-By: Andrew Gierth
Discussion: https://postgr.es/m/[email protected]
Backpatch: 11-, like 69c3936a14

Branch
------
REL_11_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/fd59b29c873915064f7af6a33c968c97e0d59166

Modified Files
--------------
src/backend/executor/execExpr.c          |  2 +-
src/test/regress/expected/aggregates.out | 15 +++++++++++++++
src/test/regress/sql/aggregates.sql      |  7 +++++++
3 files changed, 23 insertions(+), 1 deletion(-)

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