MDL-43152 JavaScript: Fix linting issue with navigation JS

blocks/navigation/yui/build/moodle-block_navigation-navigation/moodle-block_navigation-navigation-debug.js

@@ -411,7 +411,7 @@ Y.extend(TREE, Y.Base, TREE.prototype, {
         instance : {
             value : false,
             setter : function(val) {
-                return parseInt(val);
+                return parseInt(val, 10);
             }
         }
     }

blocks/navigation/yui/build/moodle-block_navigation-navigation/moodle-block_navigation-navigation.js

@@ -410,7 +410,7 @@ Y.extend(TREE, Y.Base, TREE.prototype, {
         instance : {
             value : false,
             setter : function(val) {
-                return parseInt(val);
+                return parseInt(val, 10);
             }
         }
     }

blocks/navigation/yui/src/navigation/js/navigation.js

@@ -409,7 +409,7 @@ Y.extend(TREE, Y.Base, TREE.prototype, {
         instance : {
             value : false,
             setter : function(val) {
-                return parseInt(val);
+                return parseInt(val, 10);
             }
         }
     }