bustle.cabal: add 'icons' to tarball (to fix 'make install')
bustle.cabal: add 'icons' to tarball (to fix 'make install')

Signed-off-by: Sergei Trofimovich <110fdadc76b6bce16977f568bdb4723eaed6fb3f@gentoo.org>

wjt/bustle,wjt/bustle