ref.func Opcode is overcounted

[Clashsoft]

For some reason, the ref.func opcode is overcounted, leading to an inflated count of the reference-types feature.

SELECT name, feature, countDistinct(sha256) as count
FROM "wasm_files"."wasm_opcodes"
GROUP BY name, feature
ORDER BY count DESC
LIMIT 100

@copilot, try to identify the issue from the most recent commits and be as minimally invasive as possible in the fix.