[bisq-network/bisq] Recommended security deposit display (#4426)

[James Cox]

There are three variables that go into the calculation for the number displayed in the security deposit field:

* maximum security deposit (system defined, currently 50%)
* volatility based security deposit calculation
* minimum security deposit (user definable with a hard lower bound of 15%)

If the `volatility based calculation` is lower than the minimum then the `minumum security deposit` is shown which is a user defined parameter.  At the moment, with the current volatile price swing from USD 12500 to 10400 the calculated value is around 33%.  So if you enter 15% for the user defined minimum then close and re-open the order entry screen you should see 33%.

In going through the above I noticed a bug.  By moving the cursor through the security deposit field on the order entry screen, you're setting the value for `minimum security deposit` that will be used in future.  So in this example, setting it to 33%.  When volatility goes down, the 33% still exists in the user preference for `minimum security deposit` so in essence **you'll never see lowered estimates, only higher ones**.  I think this field should not be used to persist the user preference `minimum security deposit`.  Instead I think that value should be placed on the settings screen under `General preferences`.


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