[bisq-network/proposals] Reduce minimum required security deposit (#323)

[m52go]

> _This is a Bisq Network proposal. Please familiarize yourself with the [submission and review process](https://bisq.wiki/Proposals)._

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The current minimum required security deposit is currently 0.006 BTC. **This proposal seeks to reduce it to 0.001 BTC.**

In dollar terms the current minimum of 0.006 BTC is well over 300 USD, which is way higher than intended and makes trading on Bisq impractical and inaccessible for many people, especially for those in emerging markets. The proposed rate of 0.001 BTC is ~55 USD at current rates, which is about the same as 0.006 BTC at 10,000 USD/BTC that was in place for a long time.

The proposal is a follow-up to #295 which seemed to get stalled because it ended up being too broad, so this proposal only seeks to establish consensus on how to handle the minimum security deposit.

#### Context

The rise in BTC/USD rate has vastly increased the number of <0.01 BTC trades on the network. 
- Out of a sample size of 2000 fiat trades from the middle of 2020 when BTC/USD was ~10,000 there were 90 <0.01 BTC trades.
- Out of the last 2000 fiat trades (end of February through now) when BTC/USD has remained >50,000 there were 357 <0.01 BTC trades.

It is an attractive thought to remove the limit altogether but keeping a lower minimum makes sense to keep incentives in line for smaller trades (e.g. [discourage option trades](https://github.com/bisq-network/proposals/issues/295#issuecomment-782397118)) and compensate the DAO for disputes.

#### Technical Considerations

To my knowledge this 0.006 amount is hard-coded in the software and should be changeable without major issues or disruption.

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