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Fix state restore when recording __concat metamethod.

Reported by Sergey Kaplun.

(cherry picked from commit eee16efa7)

This commit is a follow-up to the previous one. It fixes the case when
the `topslot` is adjusting for simple concatenation results. This patch
adds the update of the corresponding Lua stack slots to be restored.

This fixes back the <lj-839-concat-recording.test.lua> test.

Sergey Kaplun:
* added the description for the problem

Part of tarantool/tarantool#11055

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

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