config/lua: fix device bool int reads

[imperishableSecret]

Describe your PR, what does it fix/add?

Fixes Lua config reads for pointer device options that are declared as boolean values but consumed through the integer device-config getter.

The Lua backend previously implemented getDeviceInt() by directly casting every stored value to Config::INTEGER. That is invalid for bool-backed options such as left_handed and natural_scroll, which are stored as Config::BOOL. When pointer config was reapplied during reload/refresher work, this could read a bool value as a nonzero integer and incorrectly enable libinput options, making mouse buttons appear swapped and scroll direction appear inverted.

This PR adds a virtual integer conversion hook for Lua config values:

• int values return their stored integer
• bool values return 0 or 1
• float values return their stored float
• vec2 values return their stored vector
• string values return their stored string
• unsupported value/type combinations assert instead of being reinterpreted through an invalid pointer cast

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