Fixup! remove fdescribe and add second trace to test

Author: mdtusz

test/jasmine/tests/range_slider_test.js

@@ -309,7 +309,7 @@ describe('the range slider', function() {
         });
     });
 
-    fdescribe('when used with gl traces', function() {
+    describe('when used with gl traces', function() {
 
         beforeEach(function() {
             gd = createGraphDiv();
@@ -322,6 +322,10 @@ describe('the range slider', function() {
                 x: [1,2,3],
                 y: [2,3,4],
                 type: 'scattergl'
+            }, {
+                x: [1,2,3],
+                y: [2,3,4],
+                type: 'scattergl'
             }];
 
             Plotly.plot(gd, data, mock.layout).then(function() {