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x64: Properly fix __call metamethod return dispatch.

Reported by Sergey Kaplun.

(cherry-picked from commit d133d67c8)

This patch is the follow-up for the commit
1672bdc0f ("x64: Fix __call metamethod
return dispatch."). This patch uses the incorrect macro x64 (which is
undefined in dasm) instead of X64. `KBASE` (r15d) is still compared
against `BASE` (edx) instead of `KBASEa` (r15) against rdx.

This patch fixes the typo, so the correct registers are chosen.

Sergey Kaplun:
* added the description for the problem

Part of tarantool/tarantool#9145

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