[Message] color overwrites floating

[ColinFrick]

Original issue: Semantic-Org/Semantic-UI#6590

Steps

1. open https://react.semantic-ui.com/collections/message/#variations-floating

2. edit `floating`  and add a `color`

import React from 'react'
import { Message } from 'semantic-ui-react'

const MessageExampleFloating = () => <Message floating color="orange">Way to go!</Message>

export default MessageExampleFloating

Expected Result

Something like this, which I created by removing some styles via the inspector:

Actual Result

Without the color the element looks correct:

### Version

v0.82.5 (2018-09-12) i guess?