Cleanup linkifyjs when the editor is destroyed

[educastellano]

I was getting these warnings after pasting links and then destroying and creating a new editor again:

linkifyjs: already initialized - will not register custom protocol "ftp" until you manually call linkify.init(). 
To avoid this warning, please register all custom protocols before invoking linkify the first time.

With the extension being called like this:

Link.configure({
  protocols: ['ftp', 'mailto']
})

Resetting linkifyjs when the editor is destroyed fixes this.

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