[ox/fs] Change substr function form

(synced from dd16577b50)

src/ox/fs/filesystem/passthroughfs.cpp

@@ -188,7 +188,7 @@ Error PassThroughFS::writeFileInode(uint64_t, const void*, uint64_t, FileType) n
 std::string_view PassThroughFS::stripSlash(StringView path) noexcept {
 	const auto pathLen = ox_strlen(path);
 	for (auto i = 0u; i < pathLen && path[0] == '/'; i++) {
-		path = path.substr(1);
+		path = substr(path, 1);
 	}
 	return {path.data(), path.bytes()};
 }