[gnome-games] flatpak: Unpin mGBA commit

[Adrien Plazas <aplazas src gnome org>]

commit 4082907e77c763b9e5de033ee66070c3711e52f0
Author: Exalm <exalm7659 gmail com>
Date:   Mon Apr 16 12:01:01 2018 +0500

    flatpak: Unpin mGBA commit

 flatpak/libretro-cores/libretro-mgba.json | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/flatpak/libretro-cores/libretro-mgba.json b/flatpak/libretro-cores/libretro-mgba.json
index b1734c5..2be887d 100644
--- a/flatpak/libretro-cores/libretro-mgba.json
+++ b/flatpak/libretro-cores/libretro-mgba.json
@@ -17,8 +17,7 @@
             "sources": [
                 {
                     "type": "git",
-                    "url": "https://github.com/libretro/mgba";,
-                    "branch": "a5e1a1b47ebfaf045d559cd2a29f0a4b69f6f59c"
+                    "url": "https://github.com/libretro/mgba";
                 },
                 {
                     "type": "file",