LootValue breaks stats preview in Edit Build screen

[jakefoglia]

Thanks for the mod. I discovered a bug.

Steps to reproduce:

1. Enable the Mod
2. Right click a weapon in the Stash, click Edit build
3. Expand the "info" tab
4. Select an attachment slot, and hover over various attachments

Expected Behavior: Stats update in real-time as you hover over various attachments

Actual Behavior: Stats are frozen until you actually select the attachment