[GAMEPLAY] Tristana - Ult pushes from where Tristana casts her ult instead of where she is.

Should work like Lee's r + f or Vayne's e + f.

Tested on 3 skins, dragon trainer, rocket girl, and firefighter. Doesn't seem to be skin dependent.

To reproduce:

1. Press R
2. Flash behind enemy

Intended results: enemy is knocked backwards Actual results: enemy is knocked forwards