Delete icons which we do not use from liveusb-creator

Don’t install the upstream fedora icons in the binary package. => OK, verified by:

dpkg --contents  liveusb-creator_3.11.6+tails1-16+jessie3_all.deb

Check licensing compatibility so that we don’t have to drop them from the source package .

Feature Branch: 451f:liveusb-creator:feature/gtk3+9358-noicons

Original created by @u on 9358 (Redmine)

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