fscache: removePrefix(): use starts_with()

cache/fscache.cpp

@@ -46,7 +46,7 @@ void FsCache::removePrefix(std::string_view prefix)
 	// TODO: lock dir
 	for(auto &entry : std::filesystem::directory_iterator(std::filesystem::path{this->path}))
 	{
-		if(static_cast<std::string>(entry.path().filename()).find(prefix) == 0)
+		if(std::string_view(entry.path().filename().c_str()).starts_with(prefix) == 0)
 		{
 			std::filesystem::remove_all(entry);
 		}