fix(tile-chart): Fixed tile chart for preact

Author: fragsalat

src/ws-tiles-chart/tile.js

@@ -1,5 +1,4 @@
-import React from 'react';
-import {Component, PropTypes} from '../imports';
+import {React, Component, PropTypes} from '../imports';
 
 /**
  * This class describes a Preact/React component which renders a single tile

src/ws-tiles-chart/ws-tiles-chart.js

@@ -1,5 +1,4 @@
-import React from 'react';
-import {Component, PropTypes} from '../imports';
+import {React, Component, PropTypes} from '../imports';
 import {Tile} from './tile';
 
 /**