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FFI: Avoid dangling cts->L.

Reported by ZumiKua.

(cherry picked from commit c94312d34)

When executing cdata finalizer on some lua_State, this state is set to
`cts->L`. If the state will be GC-ed and freed later, this reference
becomes dangling, so any FFI callback will use this invalid reference.

This patch fixes it by setting `cts->L` to the `mainthread` on the
destruction of the referenced one.

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

Part of tarantool/tarantool#12134

Reviewed-by: Sergey Bronnikov <sergeyb@tarantool.org>
Signed-off-by: Sergey Kaplun <skaplun@tarantool.org>

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