Fix filter in snapshot test

Snaphot objects are opaque. So a color with alpha < 255 is not
valid. I kinda wonder:
- if snapshot objects should really be opaque
- should this have been properly handled by the image object?

src/bin/snapshot_widgets_file_icons.c

@@ -84,7 +84,7 @@ static void _setup(void)
      }
 
    const char *filter =
-      "blur { 5, dst = a, color = '#ff08' }"
+      "blur { 5, dst = a, color = '#ff0' }"
      ;
 
    o = eo_add(EVAS_IMAGE_CLASS, evas);