fix(ui): extend lora weight schema to accept full range of weights

[psychedelicious]

Summary

This could cause a failure to rehydrate LoRA state, or failure to recall a LoRA.

Related Issues / Discussions

Closes #8551

Bug was introduced when we moved to server-backed persistence.

QA Instructions

• Add a LoRA
• Set the weight to something outside the default -1 to 2 range (e.g. 5)
• Generate
• Recall metadata from that image
  • Before the fix, it wouldn't recall the LoRA. After the fix, it will.
• Refresh the page
  • Before the fix, the LoRA setup will disappear (i.e. rehydration failure). After the fix, it will rehydrate successfully.

Merge Plan

n/a

Checklist

• The PR has a short but descriptive title, suitable for a changelog
• Tests added / updated (if applicable)
• ❗Changes to a redux slice have a corresponding migration
• Documentation added / updated (if applicable)
• Updated What's New copy (if doing a release after this PR)