Adjust annual inflation for Kava stakers from 17% to 13.5%

This proposal redirects 3.5% of inflationary Kava from kava stakers to the community pool. This lowers liquid Kava rewards for stakers in anticipation of the Kava staking derivative and maintains the funding of the community pool for Kava Developer incentives. See prop 78 (https://www.mintscan.io/kava/proposals/78) for details on the initial developer incentives proposal.