Remove unnecessary usage of slotcfg for energy shield and ward calculations

[Paliak]

Fixes #7357

Description of the problem being solved:

The usage of slotcfg seems to have been carried forward initially being added in ae21519. For player calculations slotcfg will always be:

{
    slotName = "Weapon 2"
}

Due to it only ever being set int the loop above

PathOfBuilding/src/Modules/CalcDefence.lua

Line 573 in 103646b

for _, slot in pairs({"Helmet","Gloves","Boots","Body Armour","Weapon 2","Weapon 3"}) do

This seems incorrect for a global effect and causes the shield only effects to apply causing the mentioned issue.