[gimp] build: update gi-docgen feature setting in flatpak

[Daniel Novomeský <dnovomesky src gnome org>]

commit 640bc9b7f15e4095fee7cf2f0915f1ad4add47fa
Author: Daniel Novomeský <dnovomesky gmail com>
Date:   Sun Jan 2 11:33:58 2022 +0100

    build: update gi-docgen feature setting in flatpak

 build/flatpak/org.gimp.GIMP-nightly.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/build/flatpak/org.gimp.GIMP-nightly.json b/build/flatpak/org.gimp.GIMP-nightly.json
index ad290b52d8..dfa9d8f057 100644
--- a/build/flatpak/org.gimp.GIMP-nightly.json
+++ b/build/flatpak/org.gimp.GIMP-nightly.json
@@ -801,7 +801,7 @@
         {
             "name": "gimp",
             "config-opts": [
-                "-Dgi-docgen=false",
+                "-Dgi-docgen=disabled",
                 "-Dicc-directory=/run/host/usr/share/color/icc/",
                 "-Dbuild-id=org.gimp.GIMP.flatpak.nightly",
                 "-Dcheck-update=no"