Remove onMouseLeave from simulator

Author: xnkevinnguyen

src/view/components/microbit/MicrobitImage.tsx

@@ -10,7 +10,6 @@ import { IRefObject, MicrobitSvg } from "./Microbit_svg";
 interface EventTriggers {
     onMouseUp: (event: Event, buttonKey: string) => void;
     onMouseDown: (event: Event, buttonKey: string) => void;
-    onMouseLeave: (event: Event, buttonKey: string) => void;
     onKeyEvent: (event: KeyboardEvent, active: boolean, key: string) => void;
 }
 interface IProps {

src/view/components/microbit/MicrobitSimulator.tsx

@@ -124,7 +124,6 @@ export class MicrobitSimulator extends React.Component<any, IState> {
                         eventTriggers={{
                             onMouseDown: this.onMouseDown,
                             onMouseUp: this.onMouseUp,
-                            onMouseLeave: this.onMouseLeave,
                             onKeyEvent: this.onKeyEvent,
                         }}
                         leds={this.state.microbit.leds}