Flatpak: update GTK4 to latest git

GTK 4.2.0 has some problems that were fixed recently. Update to post release git.

pkgs/flatpak/lib/gtk4-broadway-fix-unsafe-variable-type.patch

@@ -1,26 +0,0 @@
-From c6320cfd75c65bfb1736b7ca5afc9c0f5ffc09d7 Mon Sep 17 00:00:00 2001
-From: =?UTF-8?q?Rafa=C5=82=20Dzi=C4=99giel?= <rafostar.github@gmail.com>
-Date: Thu, 25 Feb 2021 09:45:38 +0100
-Subject: [PATCH] Broadway: fix unsafe variable type
-
-Only guint32 guarantees to be always 32bit on all platforms. Mixing 32bit and 64bit memory sizes leads to a crash.
----
- gdk/broadway/gdkbroadway-server.c | 2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
-
-diff --git a/gdk/broadway/gdkbroadway-server.c b/gdk/broadway/gdkbroadway-server.c
-index 02b6f93183..e6b96ff0b9 100644
---- a/gdk/broadway/gdkbroadway-server.c
-+++ b/gdk/broadway/gdkbroadway-server.c
-@@ -235,7 +235,7 @@ static void
- parse_all_input (GdkBroadwayServer *server)
- {
-   guint8 *p, *end;
--  size_t size;
-+  guint32 size;
-   BroadwayReply *reply;
- 
-   p = server->recv_buffer;
--- 
-2.26.2
-

pkgs/flatpak/lib/gtk4.json

@@ -18,16 +18,12 @@
         {
             "type": "git",
             "url": "https://gitlab.gnome.org/GNOME/gtk.git",
-            "tag": "4.1.1",
-            "commit": "1f284fcd706de5b0b8c54fee3ff61880caf1d167"
+            "branch": "master",
+            "commit": "1c2238cc2abbca0486a5fdac5523efc268affb96"
         },
         {
             "type": "patch",
             "path": "gtk4-popover-unrealize.patch"
-        },
-        {
-            "type": "patch",
-            "path": "gtk4-broadway-fix-unsafe-variable-type.patch"
         }
     ]
 }