src: Avoid emoji typing during Unicode typing
src: Avoid emoji typing during Unicode typing

If 'sk' layout is used, digit keys need Shift key and
Unicode typing of U+1AE requires Shift key after Ctrl-Shift-u.
This patch does not enable the emoji typing with Ctrl-Shift-e
during Unicode typing.

BUG=rhbz#1403985

Review URL: https://codereview.appspot.com/311510043

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