[gegl] map-relative: remove "box-filter" property

[Ell <ell src gnome org>]

commit 8f5fcabad1dfdd923de9ee4eb7e5b4f9991f07bb
Author: Ell <ell_se yahoo com>
Date:   Sun Mar 3 13:29:53 2019 -0500

    map-relative: remove "box-filter" property
    
    It was accidentally added in commit
    7e1ddbb250a17e0ebd37f4fa397025c9d87fe9ee, and was only used for
    testing.

 operations/common/map-relative.c | 2 --
 1 file changed, 2 deletions(-)
---
diff --git a/operations/common/map-relative.c b/operations/common/map-relative.c
index d70fb18b5..54a2480cd 100644
--- a/operations/common/map-relative.c
+++ b/operations/common/map-relative.c
@@ -31,8 +31,6 @@ property_enum (abyss_policy, _("Abyss policy"),
                GeglAbyssPolicy, gegl_abyss_policy,
                GEGL_ABYSS_NONE)
 
-property_boolean (box_filter, _("Box filter"), FALSE)
-
 #else
 
 #define GEGL_OP_COMPOSER