GH-36856: [C++] Remove needless braces from BasicDecimal256FromLE() arguments #36987
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Rationale for this change
BasicDecimal256FromLE() requires 4 arguments. So we should not use BasicDecimal256FromLE({X, X, X, X}) form.
I don't know why the current form works on amd64 but doesn't work on s390x.
What changes are included in this PR?
Removed needless "{" and "}".
Are these changes tested?
Yes.
Are there any user-facing changes?
Yes.