kfileitemmodel: Avoid zero-as-null-pointer-constant warnings in natural sort

The natural sort comparison helpers compare Qt::strong_ordering values
against the literal 0. The compiler reads that 0 as a null pointer
constant and warns under -Wzero-as-null-pointer-constant.

Use the named ordering helpers is_lt, is_gt and is_neq instead, which
express the same checks without a literal 0. The plain integer
comparisons in the surrounding code are left as they are.

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