Removed emoji button from notes form

app/views/projects/notes/_hints.html.haml

 .comment-toolbar.clearfix
-  %button.toolbar-button.js-toolbar-button{ type: 'button', data: { prefix: ':' }, tabindex: '-1' }
-    = icon('smile-o', class: 'toolbar-button-icon')
-    Emoji
   .toolbar-text
     Styling with
     = link_to 'Markdown', help_page_path('markdown', 'markdown'), target: '_blank', tabindex: -1