fix: include wbc_max in SIRS WBC missing-data guard

[Chessing234]

Summary

• SIRS WBC scoring uses wbc_min, wbc_max, and bands_max, but the missing-data arm only checked COALESCE(wbc_min, bands_max).
• When only wbc_max is present (and normal), the CASE fell through to NULL instead of 0.
• Update BigQuery, Postgres, and DuckDB copies for MIMIC-III and MIMIC-IV.

Test plan

• Row with NULL wbc_min/bands_max and present normal wbc_max → wbc_score = 0
• All three NULL → wbc_score remains NULL
• Elevated wbc_max / low wbc_min / high bands_max still score 1

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