chore: sync nightly flatpak manifest with flathub's

Signed-off-by: guihkx <626206+guihkx@users.noreply.github.com>

flatpak/patches/gamemode.patch

@@ -1,12 +0,0 @@
-diff -ruN a/common/common-pidfds.c b/common/common-pidfds.c
---- a/common/common-pidfds.c	2021-02-18 20:00:12.000000000 +0100
-+++ b/common/common-pidfds.c	2023-09-07 08:57:42.954362763 +0200
-@@ -58,6 +58,8 @@
- {
- 	return (int)syscall(__NR_pidfd_open, pid, flags);
- }
-+#else
-+#include <sys/pidfd.h>
- #endif
- 
- /* pidfd functions */