update icons submodule - electrum - Electrum Bitcoin wallet

commit 8f25e147fdf3117d1be116b8c7952e1a3afb30d7
parent 7feba2a2000ac11d8b1bdf366e4d6fa05e0cbd52
Author: ThomasV <thomasv@electrum.org>
Date:   Fri, 29 Jun 2018 13:43:26 +0200

update icons submodule

	electrum Electrum Bitcoin wallet
	git clone https://git.parazyd.org/electrum
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