[JIRAALIGN-1120] Forecast: Remaining Capacity displays incorrect value, when Capacity is defined trough Plan Capacity

Issue Summary

Forecast: Remaining Capacity displays the incorrect value when Capacity is defined trough Plan Capacity

Steps to Reproduce

1. Create a Portfolio, program, and PI. 
2. Create Epic. 
3. In Forecast access Plan Capacity and Configure it using Override Weeks in Sprint and Override people per team options. 
4. Go back to Forecast and set some allocation for Epic

Expected Results

Remaining Capacity = Program Total Capacity - Epic Allocation

Actual Results

Remaining Capacity = 0 - Epic Allocation

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available