avoid using .ends_with()

viewer/glow-extras/viewer/detail/command_queue.cc

@@ -300,7 +300,7 @@ void glow::viewer::detail::set_cache_window_size_folder(std::string_view s)
     folder = s;
     if(folder.empty()) return;
 
-    if(!folder.ends_with("/")) folder.append("/");
+    if(folder.back() != '/') folder.append("/");
     if(!std::filesystem::exists(folder))
     {
         glow::warning() << "Target folder for window size caching does not exist! Defaulting to working directory.";