fix(height): coalesce join keys from h2 in MIMIC-III pivoted height

The FULL OUTER JOIN between cm and inch height measurements used
COALESCE(h1.subject_id, h1.subject_id) (and the same for charttime),
dropping rows that only appear in h2. Use h2 for the fallback keys.

Related to MIT-LCP#2010.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: Chessing234

mimic-iii/concepts/pivot/pivoted_height.sql

@@ -52,8 +52,8 @@ WITH ht_in AS
 , ht_stg0 AS
 (
   SELECT
-  COALESCE(h1.subject_id, h1.subject_id) as subject_id
-  , COALESCE(h1.charttime, h1.charttime) AS charttime
+  COALESCE(h1.subject_id, h2.subject_id) as subject_id
+  , COALESCE(h1.charttime, h2.charttime) AS charttime
   , COALESCE(h1.height, h2.height) as height
   FROM ht_cm h1
   FULL OUTER JOIN ht_in h2