[shotwell] flatpak: Move to latest 0.26 commit

[Jens Georg <jensgeorg src gnome org>]

commit 2b525290cef606c105226b72c9e98b2a67b903be
Author: Jens Georg <mail jensge org>
Date:   Tue Sep 11 23:27:34 2018 +0200

    flatpak: Move to latest 0.26 commit

 flatpak/org.gnome.Shotwell.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/flatpak/org.gnome.Shotwell.json b/flatpak/org.gnome.Shotwell.json
index 27f3772e..4da6e8b0 100644
--- a/flatpak/org.gnome.Shotwell.json
+++ b/flatpak/org.gnome.Shotwell.json
@@ -98,7 +98,7 @@
                 {
                     "type": "git",
                     "url": "https://github.com/Exiv2/exiv2/";,
-                    "commit" : "4aa57ad0217dfc509b42c5398602cede11fb8528"
+                    "commit" : "e7ffd83af29187190da7f98dcbca8a4d70e19582"
                 }
             ]
         },