bug#72797: qt-tools is unnecessary optional dependency for monero

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Hi Guix community,

Thank you for your great software :)

I noticed that the Monero package has an (a huge) unnecessary dependency here [1]. qt is an optional dependency for Monero code base (we only need that in case of using translations). 

Anyway to make this optional? or get rid of this?

1.https://git.savannah.gnu.org/cgit/guix.git/tree/gnu/packages/finance.scm#n716

Freedom wins.
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