Fees should use the right units

Follow-up to !5 (comment 40410)

Looking at the code in develop right now I think it still suffers from one of the issues I mentioned, which is that the fees are multiplied by powBase (https://git.duniter.org/clients/cesium-grp/cesium2s/-/blob/develop/src/app/account/accounts.service.ts?ref_type=heads#L483) when in fact they souldn't, as they are in GDcents and not GD (see https://git.duniter.org/clients/cesium-grp/cesium2s/-/blob/develop/src/app/network/network.service.ts?ref_type=heads#L25).

src/app/account/accounts.service.ts

@@ -479,9 +479,8 @@ export class AccountsService extends RxStartableService<AccountsState> {
       throw new Error('ERROR.AMOUNT_NEGATIVE');
     }
 
-    // Remove decimals, in amount and fee
+    // Convert amount to right unit ("cents")
     amount = amount * powBase;
-    if (fee) fee = fee * powBase;
 
     // Check fee validity
     fee = fee || currency.fees?.tx || 0;