Fix insertHist macro to use non-cstr key

Author: njacazio

ALICE3/TableProducer/OTF/onTheFlyTracker.cxx

@@ -69,7 +69,7 @@ using std::array;
 #define getHist(type, name) std::get<std::shared_ptr<type>>(histPointers[name])
 #define fillHist(type, name, ...) \
   std::get<std::shared_ptr<type>>(histPointers[name])->Fill(__VA_ARGS__);
-#define insertHist(name, ...) histPointers[(name).c_str()] = histos.add((name).c_str(), __VA_ARGS__);
+#define insertHist(name, ...) histPointers[name] = histos.add((name).c_str(), __VA_ARGS__);
 
 struct OnTheFlyTracker {
   Produces<aod::Collisions> tableCollisions;