input: fix reloading crash due to keyboard group configuring

Keyboard group keyboards should not call sway_keyboard_configure. They
do not have an input config and they derive their state from the
keyboards within the group.

For some reason, I got sway_keyboard_configure and
seat_configure_keyboard mixed up and thought seat_reset_device called
the latter.

Calling sway_keyboard_configure with a keyboard group's keyboard is not
supported and can cause issues. If any clients are listening to the ipc
input event, a sigsegv will occur due to not every property - such as
identifier - being wired up for keyboard group keyboard's.

This also adds an assertion to sway_keyboard_configure to ensure that
this does not occur in the future and any instances are quickly caught.

sway/input/input-manager.c

@@ -558,13 +558,12 @@ void input_manager_reset_all_inputs() {
 
 	// If there is at least one keyboard using the default keymap, repeat delay,
 	// and repeat rate, then it is possible that there is a keyboard group that
-	// needs to be reset. This will disarm the keyboards as well as exit and
-	// re-enter any focus views.
+	// need their keyboard disarmed.
 	struct sway_seat *seat;
 	wl_list_for_each(seat, &server.input->seats, link) {
 		struct sway_keyboard_group *group;
 		wl_list_for_each(group, &seat->keyboard_groups, link) {
-			seat_reset_device(seat, group->seat_device->input_device);
+			sway_keyboard_disarm_key_repeat(group->seat_device->keyboard);
 		}
 	}
 }

sway/input/keyboard.c

@@ -853,6 +853,12 @@ void sway_keyboard_configure(struct sway_keyboard *keyboard) {
 	struct wlr_input_device *wlr_device =
 		keyboard->seat_device->input_device->wlr_device;
 
+	if (!sway_assert(!wlr_keyboard_group_from_wlr_keyboard(wlr_device->keyboard),
+				"sway_keyboard_configure should not be called with a "
+				"keyboard group's keyboard")) {
+		return;
+	}
+
 	struct xkb_keymap *keymap = sway_keyboard_compile_keymap(input_config, NULL);
 	if (!keymap) {
 		sway_log(SWAY_ERROR, "Failed to compile keymap. Attempting defaults");

sway/input/seat.c

@@ -692,12 +692,7 @@ static void seat_configure_keyboard(struct sway_seat *seat,
 	if (!seat_device->keyboard) {
 		sway_keyboard_create(seat, seat_device);
 	}
-	if (!wlr_keyboard_group_from_wlr_keyboard(
-				seat_device->input_device->wlr_device->keyboard)) {
-		// Do not configure keyboard group keyboards. They will be configured
-		// based on the keyboards in the group.
 	sway_keyboard_configure(seat_device->keyboard);
-	}
 	wlr_seat_set_keyboard(seat->wlr_seat,
 			seat_device->input_device->wlr_device);
 	struct sway_node *focus = seat_get_focus(seat);