RandomBeacon.sol: surround staking.seize with try/catch

[nkuba]

I believe we should surround all calls to staking.seize function with a try/catch block, similar as we do with staking.slash.

If we don't do that challangeDkgResult may not be effective in case of any problems in the staking contract.

https://github.com/keep-network/keep-core/blob/c9e57b21666ae090cf422b920944557759c15ab0/solidity/random-beacon/contracts/RandomBeacon.sol#L643-L648

[nkuba]

Implemented for ECDSA Wallets: f03de3b