update image tests for new attribute

Author: emilykl

test/image/baselines/icicle_packages_colorscale_novalue.png

@@ -8,6 +8,7 @@
                 "line": {
                     "color": "#777"
                 },
+                "fillet": 10,
                 "colorscale": [[0, "#FFF"], [0.01, "#FF0"], [0.1, "#F00"], [1, "#000"]],
                 "showscale": true
             },

test/image/baselines/treemap_packages_colorscale_novalue.png

@@ -9,6 +9,7 @@
 				"line": {
 					"color": "#777"
 				},
+				"fillet": 4,
 				"colorscale": [[0, "#FFF"], [0.01, "#FF0"], [0.1, "#F00"], [1, "#000"]],
 				"showscale": true
 			},