pidgin/pidgin

Remove the account parameter from purple_credential_provider_*_finish functions.

Testing Done:
Compiled and make sure the unit tests passed.

Reviewed at https://reviews.imfreedom.org/r/305/
libpurple/data/purple-url-handler.desktop.in
libpurple/protocols/null/nullprpl.c
pidgin/data/im.pidgin.Pidgin.desktop.in
sub/libpurple/data/purple-url-handler.desktop.in
sub/libpurple/protocols/null/nullprpl.c
sub/pidgin/data/im.pidgin.Pidgin.desktop.in