UI does not allow option to share < 30%

[psi]

Someone in IRC was complaining that the Router Console UI does not allow the option to share less than 30% bandwidth.

Perhaps it should allow lower participation but "warn" or show a notice in the event that less than 30% is shared.

[psi]

that should do the trick

[zzz]

In c182b371bc28158dd47262b89e5bd0cdda29e07b i2p.i2p.zzz.test2 to be propped for 0.9.15