Sort and Limit incorrect for trades when using ?market=all

[dan-da]

The ?market=all option is implemented by calling the trades::get_trades() method once for each basecurrency and then aggregating results. The get_trades() method applies sort and limit params.

However, the original code was not applying sort and limit after the aggregation.

These sorts of complications are a consequence of the fact that the web ui and api is hiding the messiness of multiple basecurrencies in the underlying data source (bisq app).

[dan-da]

fixed in db6db6c