Cannot play steamdeck with gamepad controls

[fire]

Issue description

I cannot play the steam deck with gamepad controls

Steps to reproduce

1. turn on the steam deck
2. upload v-sekai from Windows Steam Devkit
3. launch v-sekai

We can work around this by using the Steamdeck mouse and keyboard emulation.

Minimal reproduction project (For SDK or engine issues)

https://github.com/V-Sekai/v-sekai-game/archive/0a8d2101a0c92341333ad4c351c57dd5c73d3411.zip

Using a released version?

No

What OS? Any other relevant information? (V-Sekai version, Godot revision, System information)

Steamdeck

[dragonhunt02]

We should check return value of get_connected_joypads() on Steam Deck first.

v-sekai-game/addons/input_manager/input_manager.gd

Lines 352 to 365 in c397260

	setup_meta_action_input_map()
	set_active(true)
	set_invert_look_x(invert_look_x)
	set_invert_look_y(invert_look_y)
	if Input.get_connected_joypads().size() == 0:
	pass # No joypads connected
	else:
	for joypad in Input.get_connected_joypads():
	var guid: String = Input.get_joy_guid(joypad)
	connected_joypads[joypad] = JoyPadInfo.new(input_manager_const.get_joy_type_from_guid(guid))
	add_actions_for_input_device(joypad)

I think setup_meta_action_input_map is erasing joypad mappings

v-sekai-game/addons/input_manager/input_manager.gd

Lines 301 to 306 in c397260

	if input_event is InputEventJoypadButton or input_event is InputEventJoypadMotion:
	# TODO: currently only supports actions inputs defined as ALL
	if input_event.device == -1:
	input_meta_actions[action].push_back(input_event)
	InputMap.action_erase_event(action, input_event)

If get_connected_joypads() returns nothing there will be no bound actions

As test you could comment out line 305