[User Experience] Default values are not apparent in GUI

When hitting enter without indicating your choice on the following page will allow you to go through. What the program is doing isn't apparent to the end user without going through the code.

You can see what the program is actually doing here: https://github.com/bitshares/bitshares-networks/blob/5f16c2fb0d3cf4c625127b1b53c5b6cc1fab633b/pools/pool_mapper.py#L381
But IMO this could be made better by making it obvious what the choice is if the user chooses defaults

Start at pools/pool_mapper.py around line 381 and reproduce the page flow shown in the issue, pressing Enter without selecting a choice. Trace how the default is applied and make the GUI visibly identify that default; done means a user can tell what will happen before continuing.

Written by the indexing model from the issue text.