enable auto collapse size by 992px as default option

build/js/PushMenu.js

@@ -22,7 +22,7 @@ const PushMenu = (($) => {
   }
 
   const Default = {
-    autoCollapseSize: false,
+    autoCollapseSize: 992,
     enableRemember: false,
     noTransitionAfterReload: true
   }

dist/js/adminlte.js

@@ -465,7 +465,7 @@
       SHOWN: "shown" + EVENT_KEY
     };
     var Default = {
-      autoCollapseSize: false,
+      autoCollapseSize: 992,
       enableRemember: false,
       noTransitionAfterReload: true
     };