DRY settings menu

decrease saving config cycles

scripts/SettingsManager.gd

@@ -48,7 +48,6 @@ func get_setting(key: String):
 
 func set_setting(key: String, value):
 	settings[key] = value
-	save_settings()
 
 func load_languages():
 	var file = FileAccess.open("res://localization/languages.json", FileAccess.READ)

scripts/SettingsMenu.gd

@@ -47,15 +47,20 @@ func _on_volume_slider_changed(value, setting_key):
 		else:
 			AudioServer.set_bus_volume_db(bus_index, linear_to_db(value))
 
+func _exit_settings():
+	print("Exiting settings")
+	settings_manager.save_settings()
+	back_to_main_menu.emit()
+
 func _input(event):
 	if event.is_action_pressed("ui_cancel") or event.is_action_pressed("ui_menu_toggle"):
 		print("ESC pressed in settings")
-		back_to_main_menu.emit()
+		_exit_settings()
 		get_viewport().set_input_as_handled()
 
 func _on_back_button_pressed():
 	print("Back button pressed")
-	back_to_main_menu.emit()
+	_exit_settings()
 
 func setup_language_selector():
 	var languages_data = settings_manager.get_languages_data()