Prop 85: Update all vault multipliers to 0.15

This proposal changes the vault multiplier to 0.15 from 0.35 as part of our ongoing efforts to phase out Eden incentives and move towards winding down the bootstrapping phase while entering the sustainable growth phase.

Link to the proposal discussion: https://common.xyz/elys-network/discussion/1281196-Signaling%20Proposal:%20Reduce%20Vaults%20EDEN%20Incentives