Turn focus off on init

[kingeke]

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Description of your Issue or Request:

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steps to reproduce (Add more if necessary):

1. Try and turn it off

What is your Operating System, Browser and Version and Summernote Version you are using:

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1. Operating System: Windows 10

2. Browser and Version: Chrome (latest at 7/2/2019)

3. Summernote Version: v0.8.11

4. Bootstrap Version or Lite: 4.2

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[kingeke]

Even as focus is false by default. it still focuses the textarea on page load

[lqez]

I failed to reproduce on Chrome / macOS.
Please let me know how to reproduce in detail.
https://youtu.be/tPZPeG9UTzA