pidgin/pidgin

Simplify some button images

14 months ago, Elliott Sales de Andrade
2e49acd1c587
Simplify some button images

Testing Done:
Opened a few notifications from the Demo protocol.

Reviewed at https://reviews.imfreedom.org/r/2411/
libpurple/data/purple-url-handler.desktop.in
libpurple/protocols/null/nullprpl.c
pidgin/data/im.pidgin.Pidgin.desktop.in