Fix 'window.cursor = null' on HTML5 (resolve openfl/openfl#2021)

src/lime/_internal/backend/html5/HTML5Window.hx

@@ -63,7 +63,6 @@ class HTML5Window {
 	private var cacheMouseX:Float;
 	private var cacheMouseY:Float;
 	private var cursor:MouseCursor;
-	private var cursorHidden:Bool;
 	private var currentTouches = new Map<Int, Touch> ();
 	private var isFullscreen:Bool;
 	private var parent:Window;
@@ -82,6 +81,7 @@ class HTML5Window {
 
 		this.parent = parent;
 
+		cursor = DEFAULT;
 		cacheMouseX = 0;
 		cacheMouseY = 0;
 
@@ -1045,7 +1045,7 @@ class HTML5Window {
 
 			if (value == null) {
 
-				parent.element.style.cursor = null;
+				parent.element.style.cursor = "none";
 
 			} else {
 
@@ -1322,21 +1322,6 @@ class HTML5Window {
 	}
 
 
-	public function showCursor ():Void {
-
-		if (cursorHidden) {
-
-			cursorHidden = false;
-
-			var cacheValue = cursor;
-			cursor = null;
-			setCursor (cacheValue);
-
-		}
-
-	}
-
-
 	private function updateSize ():Void {
 
 		if (!parent.__resizable) return;