fix: correct span for prefix operator

[asterite]

Description

Problem

Resolves #5523

Summary

The span of a Prefix expression was taken from its prefixed expression instead of from the entire expression.

Additional Context

I'm not sure how to test this 🤔

Documentation*

Check one:

• No documentation needed.
• Documentation included in this PR.
• [For Experimental Features] Documentation to be submitted in a separate PR.

PR Checklist*

• I have tested the changes locally.
• I have formatted the changes with Prettier and/or cargo fmt on default settings.