use standard mouse button names for left/right/middle click and scroll wheel

QT (at least 5/6) applications check for these names (or no name). The previous "Button X" labels caused scroll wheel to be disabled on all QT applications using inputs from this driver.

https://github.com/qt/qtbase/blob/4e158f6bfa7d0747d8da70b3b15a44b52e35bb8a/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp#L167-L188

https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-input-joystick/+bug/2065512