fix gl2d cleanPlot test

Author: alexcjohnson

test/jasmine/tests/cartesian_test.js

@@ -186,7 +186,7 @@ describe('restyle', function() {
             .then(done);
         });
 
-        it('can legend-hide the second and only scattergl trace', function(done) {
+        it('@gl can legend-hide the second and only scattergl trace', function(done) {
             Plotly.plot(gd, [
                 {y: [1, 2, 3], type: 'bar'},
                 {y: [1, 2, 3], xaxis: 'x2', yaxis: 'y2', type: 'scattergl'}

test/jasmine/tests/gl2d_plot_interact_test.js

@@ -39,7 +39,7 @@ describe('@gl Test removal of gl contexts', function() {
             expect(gd._fullLayout._plots.xy._scene).toBeDefined();
             Plots.cleanPlot([], {}, gd._fullData, gd._fullLayout);
 
-            expect(gd._fullLayout._plots.xy._scene).toBeUndefined();
+            expect(!!gd._fullLayout._plots.xy._scene).toBe(false);
         })
         .then(done);
     });