The mouse pointer in lightdm does not match the one in use in the Mate Desktop. lighdm should use the same cursor theme as the desktop.

• Adding postinst script to make changes in Paper icon theme to register itself using update-alternatives with high priority than others. Leading to closing of bug number

Side-effects: None so far

Tested: OK

Closed bugzilla entry: https://bugs.hamaralinux.org/show_bug.cgi?id=408