Risky buy function should use same like calculate buy price logic

[AndreyMashukov]

https://github.com/AndreyMashukov/go-crypto-bot/blob/450a7a975e6e5b1e78047c62f96f4572f43d993d/src/service/exchange/loss_security.go#L27

Risky buy function should use same like calculate buy price logic:

• signals
• interpolation
• prediction
• low price
• same...