Add Light Radius to weighted trade stats

[ZenJediMind]

Description of the problem being solved:

Light Radius was not available as a stat weight for weighted trade searches. It now is.

Steps taken to verify a working solution:

• Tested that generating a trade link which includes weights for light radius worked as expected
• Tested that other weights still work as expected such as life and life regen.

Link to a build that showcases this PR:

Any build, but I used captainlance's build: https://pobb.in/7lt4HaxhitFu

Before screenshot:

After screenshot: