[gimp] build: arrrgh! Also the commit for GIMP repo!

[Jehan Pagès <jehanp src gnome org>]

commit b9260266ab98b14dd69bb45a103844a2469a03fc
Author: Jehan <jehan girinstud io>
Date:   Wed Dec 13 22:57:11 2017 +0100

    build: arrrgh! Also the commit for GIMP repo!

 build/flatpak/org.gimp.GIMP-dev.json |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/build/flatpak/org.gimp.GIMP-dev.json b/build/flatpak/org.gimp.GIMP-dev.json
index df537d7..c1e5dae 100644
--- a/build/flatpak/org.gimp.GIMP-dev.json
+++ b/build/flatpak/org.gimp.GIMP-dev.json
@@ -62,7 +62,7 @@
                     "type": "git",
                     "url": "git://git.gnome.org/gimp",
                     "branch": "GIMP_2_9_8",
-                    "commit": "5afea2f6d3ce5160362df930883d62fb9e0728c6"
+                    "commit": "18794a6ba2915ed58b82337edaba794d69f767b7"
                 }
             ],
            "post-install": [