don't run mapbox modebar test on CI

- too slow on CircleCI machines

Author: etpinard

test/jasmine/tests/modebar_test.js

@@ -920,7 +920,7 @@ describe('ModeBar', function() {
 
         });
 
-        describe('mapbox handlers', function() {
+        describe('@noCI mapbox handlers', function() {
             it('button *resetViewMapbox* should reset the mapbox view attribute to their default', function(done) {
                 var gd = createGraphDiv();