Fix the bleedin' masteries

Grasp of the Undying gives me 1.5% max health healing every 4 seconds in combat. If I have 4,000 health, that's 60 healing every four seconds I remain in combat, while the ADC is ripping off ~200 every half-second or so, assuming I'm stacked with armor.

Courage of the Colossus gives me a shield worth 254 if I have 4,000 health. That'll stop one and a quarter autos from Caitlyn, and is barely more impactful than a damn Ruby Crystal in the late game.

Stoneborn Pact gives me +254 permanent health if I have 4,000 health. Again, that'll stop one and a quarter autos from Caitlyn and it doesn't even refresh. For my allies, it heals 100 health over 2 seconds, assuming they focus the branded enemy to begin with in the heat of it all.

The impact tanky masteries have is a joke, and they could really use a buff. They're not the only ones by the way, but they're the only group that's pretty useless across the board.