updated 2D_Density all_args test for changed rgb() --no longer a float in rgb colors

Author: Kully

plotly/tests/test_core/test_tools/test_figure_factory.py

@@ -1402,7 +1402,7 @@ def test_2D_density_all_args(self):
             point_size=3, height=800, width=800)
 
         exp_2D_density_chart = {
-            'data': [{'marker': {'color': 'rgb(0.0, 0.0, 127.5)',
+            'data': [{'marker': {'color': 'rgb(0.0, 0.0, 127)',
                       'opacity': 0.4,
                       'size': 3},
                       'mode': 'markers',