fix delete instead of array delete

src/actsim_agent/downloader.cpp

@@ -297,7 +297,7 @@ bool Downloader::fetch_design([[maybe_unused]]const db::uuid_t& id, std::string&
 
     // and return the name of the file we just created
     design = std::string(temp_name);
-    delete temp_name;
+    delete[] temp_name;
 
     return true;
 }