flatpak: Update GTK4 to 4.6.4

With latest GTK 4.6.4 the issues with opening popovers are finally fixed. Stop patching older version and just build the latest one.

pkgs/flatpak/testing/gtk4-popover-unrealize.patch

@@ -1,31 +0,0 @@
-From b413ee2c7d458c7005d3d3d1da8822cd86893ac0 Mon Sep 17 00:00:00 2001
-From: Rafostar <40623528+Rafostar@users.noreply.github.com>
-Date: Fri, 4 Dec 2020 19:25:34 +0100
-Subject: [PATCH] popover: Call unrealize on hide
-
-When popover is shown "realize" method is called which creates a new
-surface for popup. Unfortunately this causes performance drop on Wayland until that
-surface is destroyed what happens inside "unrealize" method during popover destruction.
-
-This commit changes default behavior in a way that surface will be destroyed
-when popover is closed and app will ragain the performance it lost when
-popover was shown.
----
- gtk/gtkpopover.c | 1 +
- 1 file changed, 1 insertion(+)
-
-diff --git a/gtk/gtkpopover.c b/gtk/gtkpopover.c
-index 504dcd6cc1..a7a764d483 100644
---- a/gtk/gtkpopover.c
-+++ b/gtk/gtkpopover.c
-@@ -951,6 +951,7 @@ gtk_popover_hide (GtkWidget *widget)
- 
-   gtk_popover_set_mnemonics_visible (GTK_POPOVER (widget), FALSE);
-   _gtk_widget_set_visible_flag (widget, FALSE);
-+  gtk_widget_unrealize (widget);
-   gtk_widget_unmap (widget);
-   g_signal_emit (widget, signals[CLOSED], 0);
- }
--- 
-GitLab
-

pkgs/flatpak/testing/gtk4.json

@@ -26,12 +26,8 @@
         {
             "type": "git",
             "url": "https://gitlab.gnome.org/GNOME/gtk.git",
-            "tag": "4.6.2",
-            "commit": "aec7ca82007dbe07faee6be084d20758ebac2b91"
-        },
-        {
-            "type": "patch",
-            "path": "gtk4-popover-unrealize.patch"
+            "tag": "4.6.4",
+            "commit": "1e6bad6c4f412dc0eb7b2f508cb4465929a04303"
         }
     ]
 }