pidgin/pidgin

Remove some old GtkStyle stuff that was setup for tab labels that was replaced some time ago with css

Testing Done:
Compiled and ran locally. Tested, plain, new message, typing, and stopped typing colors.

Reviewed at https://reviews.imfreedom.org/r/410/
i18n = import('i18n')
i18n.gettext('pidgin',
args : '--from-code=utf-8',
install : get_option('nls'),
)