Fix Blank Space Component Background

For some reason the background of the Blank Space Component was never rendered.

src/layout/BlankSpace.tsx

@@ -1,5 +1,6 @@
 import * as React from "react";
 import * as LiveSplit from "../livesplit";
+import { gradientToCss } from "../util/ColorUtil";
 
 export interface Props { state: LiveSplit.BlankSpaceComponentStateJson }
 
@@ -10,6 +11,7 @@ export default class BlankSpace extends React.Component<Props> {
                 className="blank-space"
                 style={{
                     height: this.props.state.height,
+                    background: gradientToCss(this.props.state.background),
                 }}
             />
         );