fix(display-name): disable spell check on editing local name

react/features/display-name/components/DisplayName.web.js

                     onKeyDown = { this._onKeyDown }
                     placeholder = { t('defaultNickname') }
                     ref = { this._setNameInputRef }
+                    spellCheck = { 'false' }
                     type = 'text'
                     value = { this.state.editDisplayNameValue } />
             );