Prop 107: Update Marketplace Listing Fee

As discussed here: https://commonwealth.im/stargaze/discussion/8796-nft-market-listing-fee-maximum-mint-limit-per-wallet-changes

This proposal seeks to increase the marketplace listing fee to 5 STARS. 5 STARS was decided as a better deterrent for spam listings and more likely to be successful in preventing bots.

Vote Yes: To support a marketplace listing fee of 5 STARS.

Vote No: To support the current marketplace listing fee of 0 STARS.