Traffic: add missing siteRawUrl to props (#8661)

`commonProps` is passed on to `GoogleAnalytics` component which expects `siteRawUrl` url to be present:

https://github.com/Automattic/jetpack/blob/537309fd4a530257e4aa6ab5fa104e6496cda995/_inc/client/traffic/google-analytics.jsx#L38

Without this a link in the component will render like show:

`https://wordpress.com/stats/day/undefined`

_inc/client/traffic/index.jsx

@@ -28,6 +28,7 @@ export const Traffic = React.createClass( {
 	render() {
 		const commonProps = {
 			settings: this.props.settings,
+			siteRawUrl: this.props.siteRawUrl,
 			getModule: this.props.module,
 			isDevMode: this.props.isDevMode,
 			isUnavailableInDevMode: this.props.isUnavailableInDevMode