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FFI: Fix ffi.metatype() for non-raw types.

Reported by 999pingGG.

(cherry picked from commit 4c35a42d9)

This patch is a follow-up to the previous commit. Since the child id is
used for the index in the lookup table, it has no effect, and metatype
methods are not overloaded. This patch fixes the behaviour by using the
correct index.

Sergey Kaplun:
* added the description and the test for the problem

Part of tarantool/tarantool#9924

Reviewed-by: Maxim Kokryashkin <m.kokryashkin@tarantool.org>
Reviewed-by: Sergey Bronnikov <sergeyb@tarantool.org>
Signed-off-by: Sergey Kaplun <skaplun@tarantool.org>
(cherry picked from commit 350692d2e)

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