Symtab: Pass arg_ids directly to the seed scanner.
Symtab: Pass arg_ids directly to the seed scanner.

The seed scanner never uses anything else from the seed struct, so just send
arg_ids directly. The old behavior is a relic from when callables read their
arg count from the seed's arg count (which was wrong).

crasm/lily,boardwalk/lily,crasm/lily,boardwalk/lily,crasm/lily