Fix the wayland side of https://bugs.winehq.org/show_bug.cgi?id=55336
### Exit menu key by default:
That's the actual behavior, any non-special key will exit the menu key, and be sent to the client.
I was also wondering if we should add `menu_sys_key = f10_key = 0;` when receiving a `WM_ACTIVATE` in `win32u/defwnd.c`'s `default_window_proc` but I guess not ?
### Fix repeated key for no reason:
For some reason when ALT is pressed, it is spammed and thus spams SYS_COMMAND. This fix that, but I don't know what I am doing here. I don't see any repeating key spamming with winex11 but I could be wrong. However alt/SYS_COMMAND should not be repeated.
That wasn't happening with winex11.drv.
### Fix release_all_keys modifier filtering:
That was the main reason why alt-tab leads to the menu key, NtUserGetAsyncKeyboardState also uses left and right system keys.
-- v9: win32u: Default to exit when tracking top menu