Minor fix for windows

Author: cyrusbehr

src/engine.cpp

@@ -14,7 +14,7 @@ using namespace Util;
 std::vector<std::string> Util::getFilesInDirectory(const std::string& dirPath) {
     std::vector<std::string> filepaths;
     for (const auto& entry: std::filesystem::directory_iterator(dirPath)) {
-        filepaths.emplace_back(entry.path());
+        filepaths.emplace_back(entry.path().string());
     }
     return filepaths;
 }