[gegl] dropshadow: remove effect category, dropshadow was only member

[Øyvind Kolås <ok src gnome org>]

commit f8460ed9392af1a1fbe6c2c7f91f9b292b56074c
Author: Øyvind Kolås <pippin gimp org>
Date:   Fri May 5 00:09:06 2017 +0200

    dropshadow: remove effect category, dropshadow was only member

 operations/common/dropshadow.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/operations/common/dropshadow.c b/operations/common/dropshadow.c
index c670ef0..74db3e8 100644
--- a/operations/common/dropshadow.c
+++ b/operations/common/dropshadow.c
@@ -109,7 +109,7 @@ gegl_op_class_init (GeglOpClass *klass)
 
   gegl_operation_class_set_keys (operation_class,
     "name",        "gegl:dropshadow",
-    "categories",  "effects:light",
+    "categories",  "light",
     "title",       _("Dropshadow"),
     "description",
     _("Creates a dropshadow effect on the input buffer"),