These are now used by pidgin_create_icon_from_protocol which will attempt to

load the icon for the protocol from the default GtkIconTheme if the protocol

has a non NULL value for icon-name.
pidgin_ui_init was also updated to add icon-search-path and icon-resource-path

to the default GtkIconTheme when a protocol is registered. It also scans all of

the protocols that have been already been registered as that happens before the

ui is initialized.

Removed old local icon and then ran with an inverted icon to make sure pidgin was displaying the icon from the resource.