Show Trap Cooldown for Trap Supported Spell in Black Zenith

[NL908]

Fixes #7594

Description of the problem being solved:

• When a projectile spell with no cooldown is supported by trap support in Black Zenith, the trap cooldown is not being counted and shown.

Steps taken to verify a working solution:

• Load sample PoB
• All trap skills socketed in Black Zenith should display trap cooldown
• Trap with built-in cooldown should functions the same

Link to a build that showcases this PR:

https://pobb.in/0Mgib7TyTvw0

Before screenshot:

After screenshot: