fix: use double for DuckDB in test_fct_test_coverage seed

Author: b-per

integration_tests/seeds/tests/tests_seeds.yml

@@ -17,7 +17,7 @@ seeds:
   - name: test_fct_test_coverage
     config:
       column_types:
-        test_coverage_pct: &float "{{ 'float' if target.type not in ['athena', 'trino'] else 'double' }}"
+        test_coverage_pct: &float "{{ 'float' if target.type not in ['athena', 'trino', 'duckdb'] else 'double' }}"
         staging_test_coverage_pct: *float
         intermediate_test_coverage_pct: *float
         marts_test_coverage_pct: *float