Update FileTable.h

Remove TODO I forgot to remove 🤷

include/ReArchive/types/FileTable.h

@@ -11,7 +11,6 @@ namespace ReArchive {
 class ReArchive::FileTable {
 protected:
     // count
-    // TODO unordered_set so time to find a particular entry doesn't depend on the length.
     std::unordered_map<std::filesystem::path, FileEntry> entries;
 public:
     void Append(const FileEntry& file_entry);