[gimp] libgimpconfig: fix missing GimpChannel in gimp_config_param_spec_duplicate

[Jehan <jehanp src gnome org>]

commit 42750c25a73d5b566d29011c90134194971a8f95
Author: lloyd konneker <konnekerl gmail com>
Date:   Wed Jul 20 15:00:12 2022 -0400

    libgimpconfig: fix missing GimpChannel in gimp_config_param_spec_duplicate
    
    Partial fix to issue 8062
    
    Only fixing the part that I understand, that impedes enhancements to ScriptFu.

 libgimpconfig/gimpconfig-params.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/libgimpconfig/gimpconfig-params.c b/libgimpconfig/gimpconfig-params.c
index 82fb66cf1c..00beaf4c21 100644
--- a/libgimpconfig/gimpconfig-params.c
+++ b/libgimpconfig/gimpconfig-params.c
@@ -349,6 +349,7 @@ gimp_config_param_spec_duplicate (GParamSpec *pspec)
           g_strcmp0 (type_name, "GimpImage")     == 0 ||
           g_strcmp0 (type_name, "GimpDrawable")  == 0 ||
           g_strcmp0 (type_name, "GimpLayer")     == 0 ||
+          g_strcmp0 (type_name, "GimpChannel")   == 0 ||
           g_strcmp0 (type_name, "GimpSelection") == 0 ||
           g_strcmp0 (type_name, "GimpVectors")   == 0)
         {