Cannot set incentive gauge weight to 0

[UnityChaos]

The validation checks for gauge weights in an update-pool-incentives proposal are required to be positive. This makes setting a gauge to 0 weight impossible. Should be changed to positive or zero.

osmosis/x/pool-incentives/types/record.go

Lines 3 to 5 in 59db94c

	func (r DistrRecord) ValidateBasic() error {
	if !r.Weight.IsPositive() {
	return ErrDistrRecordNotPositiveWeight

(Unless there's some way to propose deleting a gauge rather than setting it to zero I'm unaware of)