[FIX] web: ace: no duplicated char with composition (html/css editor)

Before this commit, there was an issue with input method using
composition in which typed characters were duplicated.
This was occuring until the composition ended.

This is a bug specific to Google Chrome v53+.
It has been fixed in the most recent version of ace.js [1],
and we just port the fix into our custom code.

Note that we do not simply import ace.js as a whole, because
we must update lots of custom code at the same time.
We plan to do so in the future.

Fixes #23629

[1] https://github.com/ajaxorg/ace/pull/3116

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