fix: Explicitely convert std::fs::path to std::string (#1116)

This should fix the current crash when opening a project on Windows

plugins/builtin/source/content/recent.cpp

@@ -68,7 +68,7 @@ namespace hex::plugin::builtin::recent {
                     nlohmann::json recentEntry {
                         {"type", "project"},
                         {"displayName", displayName},
-                        {"path", ProjectFile::getPath()}
+                        {"path", wolv::util::toUTF8String(ProjectFile::getPath())}
                     };
 
                     recentFile.writeString(recentEntry.dump(4));