erp5_officejs_support_request_ui: Switch from ckeditor 4.5.3 to textarea for now.
Boxiang Sun authored
ckeditor 4.5.3 cannot work properly on Android and iPhone. Before update it to latest
version. We need to check the compatibility issue of other officejs. For now, just use
textarea instead buggy ckeditor.

And update the test for textarea.
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