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Clear stack after print_jit_status() in CLI.

Suggested by Hydroque.

(cherry picked from commit 03cd5aa74)

This patch makes the Lua stack balanced after using the aforementioned
function, which is considered a good practice [1]. Be aware that the
only argument on the stack is dummy NULL from the `lua_cpcall()`, so it
can be easily cleared. This doesn't change the behaviour since all calls
of `print_jit_status()` are followed by `dotty()` with a call to
`loadline()`, which clears the stack anyway.

Sergey Kaplun:
* added the description for the patch

[1]: https://www.lua.org/manual/5.1/manual.html#lua_call

Part of tarantool/tarantool#10199

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