Pidgin should use themable icons for systray

Wheezy’s Pidgin takes its systray icons explicitly from the hicolor icon theme (instead of the current theme) rather than from current theme.

icon_path = g_build_filename(DATADIR, "icons", "hicolor",
icon_sizes[i].dir, "apps", icon_sizes[i].filename, NULL)

Pidgin is written in C. The upstream code is there: https://hg.pidgin.im/pidgin/main/ The upstream ticket about this is https://developer.pidgin.im/ticket/16274

Original created by @alant on 7404 (Redmine)

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