SVGs are not linted during the pre-commit checks

[brentswisher]

Expected behavior
When I commit changes to svg file to the project, the pre-commit hooks that run properly lint it using svglint.

Actual behavior
Linting of svg files does not happen during the pre-commit stage, but running yarn lint manually does properly lint the svg files.

Steps to reproduce the issue

1. Change an svg with an invalid property, like adding fill="black" to one of the icon svgs
2. Stage and start committing the change
3. See that the error is not reported
4. Run yarn lint
5. See that the error is reported

Pharos version
14.7.0

Your environment

• OS: macOS
• Browser: N/A
• Version: N/A