updated Wayland compositor env variables

- EGL_DRIVER=egl_gallium moved to nemo-mobile-session ( https://github.com/nemomobile/nemo-mobile-session/pull/7 )
- added QT_QPA_EVDEV_MOUSE_PARAMETERS=/dev/nomouse to prevent eglfs from opening the mouse device
Merge pull request #3 from faenil/patch-1

updated Wayland compositor env variables