fs: update + consolidate path normalization logic

libraries/libstratosphere/source/fs/fs_bis.cpp

@@ -72,7 +72,7 @@ namespace ams::fs {
 
             fssrv::sf::Path sf_path;
             if (len > 0) {
-                const bool ending_sep = PathTool::IsSeparator(root_path[len - 1]);
+                const bool ending_sep = PathNormalizer::IsSeparator(root_path[len - 1]);
                 FspPathPrintf(std::addressof(sf_path), "%s%s", root_path, ending_sep ? "" : "/");
             } else {
                 sf_path.str[0] = '\x00';