Wither double dips if party member also inflicts wither

Check version

• I'm running the latest version of Path of Building and I've verified this by checking the changelog

Check for duplicates

• I've checked for duplicate open and closed issues by using the search function of the issue tracker

Check for support

• I've checked that the calculation is supposed to be supported. If it isn't please open a feature request instead (Red text is a feature request).

What platform are you running Path of Building on?

Windows

What is the value from the calculation in-game?

Wither stacks to 105% increased

What is the value from the calculation in Path of Building?

Wither stacks to 195% increased

How to reproduce the issue

1. Create a PoB that applies Wither and annoints Corruption for Wither effect
2. Set wither to 15 stacks on config
3. Export as support and import into new build
4. On new build, in config add wither stacks
5. Wither from both players will add together

PoB for PoE1 build code

https://pobb.in/Sel_22JgnnBx

Screenshots

Start by importing the supplied PoE1 build code and reproducing the configuration with 15 Wither stacks, Corruption, and a support build that also applies Wither. Trace the Wither calculation from that configuration; done means Wither from both players is combined without counting the party member's contribution twice.