Fix typo in psql zh_CN.po

[jinser]

Hi,
I found a typo here while using psql. I think this should be a trivial patch.
The typo is that there is an extra `l` before `列出所有事件触发器`.

-- 
regards,
Jinser Kafak.

0001-Fix-typo-in-psql-zh_CN.po.patch
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