Only activate the right tool if action is pressed

Previously it was possible to hold the right mouse button while the left was being held, then release the left and once the right button is released, the right tool would get activated. This commit ensures that the right tool gets activated only on first press of the right mouse button, if the left isn't already activated.

src/Autoload/Tools.gd

@@ -383,7 +383,7 @@ func handle_draw(position: Vector2, event: InputEvent) -> void:
 	elif event.is_action_released("activate_left_tool") and _active_button == BUTTON_LEFT:
 		_slots[_active_button].tool_node.draw_end(draw_pos)
 		_active_button = -1
-	elif event.is_action("activate_right_tool") and _active_button == -1:
+	elif event.is_action_pressed("activate_right_tool") and _active_button == -1:
 		_active_button = BUTTON_RIGHT
 		_slots[_active_button].tool_node.draw_start(draw_pos)
 	elif event.is_action_released("activate_right_tool") and _active_button == BUTTON_RIGHT: