Switch Mei freeze to her right click

[GreyFalcon-11737]

@LetoGheyFish-1992

becuase if you dont change her primary then Rein and Winston and Hamster remain unplayable and Orisa remains must pick.

K, so then tweak her primary a bit, instead of redesigning from scratch.

@GreyFalcon-11737

Mei

Endothermic Blaster

• Slowing effect duration reduced from 1.5sec, to 0.75sec.
• Initial Slow reduced to 20%, down from 30%
• Incremental Slows increased to 2.85% up from 2.5%