Add image_astronaut_source to mock_test.js

Author: antoinerg

test/jasmine/tests/mock_test.js

@@ -631,11 +631,11 @@ var list = [
     'hists-on-matching-axes',
     'hot_heatmap',
     'image_adventurer',
+    'image_astronaut_source',
     'image_axis_reverse',
     'image_axis_type',
     'image_cat',
     'image_colormodel',
-    'image_labuda_droplets_source',
     'image_non_numeric',
     'image_opacity',
     'image_with_gaps',