Fixed Off hand detection regarding Necromantic Aegis

[Jonathan-Dang]

Fixes #8288 .

Description of the problem being solved:

With KEYSTONE: Necromantic Aegis noded and equipment / effects that check for empty offhand, Shields in the offhand slot [Weapon 2] will always be considered empty handed during calculations.

Steps taken to verify a working solution:

-Load build that both allocates Necromantic Aegis, and has any shield with mods that affect player with any source that checks for an empty offhand; White Wind, Imperial Skean used in this case. -Check Calculations for presence of White Wind Inc when shield is equiped and unequiped on any non-complex cold damage skill. -Check Calculations for presence of White Wind Inc when shield is equiped and unequiped with no skill group active to see Minion Hit average changes.

NOTE: Freezing Pulse is set to level 1 and 0 quality for testing. Default settings applied on config section.

Link to a build that showcases this PR:

https://pobb.in/KtsIqbfE2Pxx

Before screenshot:

Freezing Pulse Before MH Hit Damage Before

After screenshot:

Freezing Pulse After MH Hit Damage After