Increase minimum governance deposit to 500 GNK

Original Proposal Text

Increase the minimum deposit required to submit a governance proposal from the current value to 500 GNK. Also sets expedited minimum deposit to 1000 GNK. Parameters: min_deposit: [object Object] max_deposit_period: null voting_period: null quorum: threshold: veto_threshold: min_initial_deposit_ratio: proposal_cancel_ratio: proposal_cancel_dest: expedited_voting_period: null expedited_threshold: expedited_min_deposit: [object Object] burn_vote_quorum: false burn_proposal_deposit_prevote: false burn_vote_veto: false min_deposit_ratio: