fixed a Morphic submenu closing bug

snap.html

@@ -4,7 +4,7 @@
         <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
         <title>Snap! Build Your Own Blocks 6.0.0 - beta -</title>
         <link rel="shortcut icon" href="src/favicon.ico">
-        <script type="text/javascript" src="src/morphic.js?version=2020-06-09"></script>
+        <script type="text/javascript" src="src/morphic.js?version=2020-06-10"></script>
         <script type="text/javascript" src="src/symbols.js?version=2020-05-28"></script>
         <script type="text/javascript" src="src/widgets.js?version=2020-05-06"></script>
         <script type="text/javascript" src="src/blocks.js?version=2020-06-04"></script>

src/morphic.js

@@ -1268,7 +1268,7 @@
 
 /*global window, HTMLCanvasElement, FileReader, Audio, FileList, Map*/
 
-var morphicVersion = '2020-June-09';
+var morphicVersion = '2020-June-10';
 var modules = {}; // keep track of additional loaded modules
 var useBlurredShadows = true;
 
@@ -8218,6 +8218,7 @@ MenuMorph.prototype.closeSubmenu = function () {
         this.submenu.destroy();
         this.submenu = null;
         this.unselectAllItems();
+        this.world.activeMenu = this;
     }
 };