[shotwell] flatpak: Adapt for gexiv2 master

[Jens Georg <jensgeorg src gnome org>]

commit 07629f5e350e294e16c2cdc8d40ba58cd3648b7d
Author: Jens Georg <mail jensge org>
Date:   Tue Jan 8 20:29:54 2019 +0100

    flatpak: Adapt for gexiv2 master

 flatpak/org.gnome.Shotwell.json | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/flatpak/org.gnome.Shotwell.json b/flatpak/org.gnome.Shotwell.json
index f01c87dd..8e9b9e5e 100644
--- a/flatpak/org.gnome.Shotwell.json
+++ b/flatpak/org.gnome.Shotwell.json
@@ -144,8 +144,8 @@
                 "/share/gir-1.0"
             ],
             "config-opts" : [
-                "-Dpython2-girdir=no",
-                "-Dpython3-girdir=no"
+                "-Dpython2_girdir=no",
+                "-Dpython3_girdir=no"
             ],
             "build-options" : {
                 "env" : {