m/pkg/fat32: replace strings.ToLower comparison with strings.EqualFold

Change-Id: Ibd22f86e500a97e147e286aaa566e13d902da588
Reviewed-on: https://review.monogon.dev/c/monogon/+/3021
Reviewed-by: Serge Bazanski <serge@monogon.tech>
Tested-by: Jenkins CI
diff --git a/metropolis/pkg/fat32/fat32.go b/metropolis/pkg/fat32/fat32.go
index d734eb7..5d26694 100644
--- a/metropolis/pkg/fat32/fat32.go
+++ b/metropolis/pkg/fat32/fat32.go
@@ -270,7 +270,7 @@
 	for j, part := range pathParts {
 		var childExists bool
 		for _, child := range inodeRef.Children {
-			if strings.ToLower(child.Name) == strings.ToLower(part) {
+			if strings.EqualFold(child.Name, part) {
 				inodeRef = child
 				childExists = true
 				break