Suggest modifying the parameter slash_ fraction_ downtime=0.01%

However, in the recent network, it is found that some validators are often jailed, and even jailed continuously. The current downtime penalty is 0.03% (slash_ fraction_ downtime=0.03%)。 When an ordinary user delegates iris token to an validator, once the validator is jailed for downtime, the user who delegate the iris token will also suffer corresponding losses, which is not very friendly to the delegator. Considering that there are 15 new validator partner, I suggest lowering the threshold and modifying the parameter slash_ fraction_ downtime=0.01%.