chore: shfmt --diff to --write for autofix

Author: bakerboy448

.pre-commit-config.yaml

@@ -45,7 +45,7 @@ repos:
         name: shfmt
         entry: shfmt
         language: system
-        args: [--diff, --indent, '2', --case-indent, --binary-next-line]
+        args: [--write, --indent, '2', --case-indent, --binary-next-line]
         types: [shell]
       - id: reddit-config-check
         name: Check Reddit config safety