[gameplay] Guinsoo's phantom proc bug with Kog Maw

When using Kog maw's W ability, Guinsoo's rage proc's every 4 autos rather than every 2 autos.

To Reproduce:

Step 1: Buy Guinsoo's Rageblade on Kog' Maw Step 2: Auto to stack Guinsoo's rage. This should proc every other auto. Step 3:Activate Kog Maw's W (Bio-Arcane Barrage). At this time, Guinsoo's rage should only proc every fourth auto.

Frequency: This happens every time I have played kog maw. 4 or 5 games at least.