[FIX] base: fix mixing currency in company/pricelist

A company should have at least a pricelist having the same currency, that's common sense.
This was causing problems in tests on 10.0-nightly, where the main pricelist was created
in EUR, then the localization module was setting the right currency on the company without
any reflection on the pricelist.
To avoid this problem, when we write the currency on a company, we reflect that change on
the main pricelist if it's the only company in the system. Otherwise as we can't decide
which pricelist modify, we just create a new one, which should be ok.

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