Minor Lee Sin tweak

There are many number adjustments that this champ could use in his curent state, but i think the main focus should be his W2, the sustain he gets through damage dealt ain´t just right when combinaed with conqueror.

The change:

Cut in half the healing effect (from 10/15/20/25/30% to 5/7.5/10/12.5/15%) as it originally was, and make the effect proc aswell on he ally he shielded. This means Lee can keep up the same sustain IF he gives up mobility (aka flat out shield himself instead of jump), or can make an ally benefit from the effect.

Ward hop in the other hand remains the same with half the current W2 effect.

We could talk aswell about his R base damage and having a root attached to its cast, but i think this is a first good step.