Add support for resetting Search Weights in Item Trader

[Peechey]

Description of the problem being solved:

Since we've introduced saving search weights to the build, I thought it would be a good idea to have a way to reset them without needing to jump into the xml, especially if you have a ton of weights set up.

Steps taken to verify a working solution:

• Resetting should default to FullDPS and TotalEHP stat weighting
• Resetting should work on init popup load and after any updates are made
• Resetting and then Canceling should revert back to previous weights
• Save and Cancel functionality should be unaffected, outside of the reverting mentioned

After screenshot:

PS: I'm aware if you hit Reset twice you lose the previous weights, but I have not figured out a clean solution yet because you kinda have to hardcode compare to the default list's stats and weightMultis.
Pushed an update for this, still hardcoding a little gross but I moved the boolean function near the other hardcoded logic so they're at least in the same place for visibility.