Update click method items in load()
This makes sure we re-read the values from the backend. While these properties are marked as constant, they apparently change after LibinputTouchpad::getConfig is called, causing issues because the changed values aren't re-read.
While I would love to fix the root cause (the properties changing while being marked constant) it would be a massively larger undertaking as in my opinion the entire code of this should be completely overhauled, right now it is fraught with races due to all the manual state management and lack of proper bindable properties.