Suppress warning on an existing packet analyzer being remapped.

There was a check generating an internal warning if a new packet
analyzer mapping overwrote an existing one. However, replacing
an existing analyzer with a new one seems a legitimate use case (and
will be supported by Spicy soon). So removing that warning.

src/packet_analysis/Dispatcher.cc

@@ -52,10 +52,6 @@ void Dispatcher::Register(uint32_t identifier, AnalyzerPtr analyzer)
 		}
 
 	int64_t index = identifier - lowest_identifier;
-	if ( table[index] != nullptr )
-		reporter->InternalWarning("Overwriting packet analyzer mapping %#8" PRIx64 " => %s with %s",
-		                          index + lowest_identifier, table[index]->GetAnalyzerName(),
-		                          analyzer->GetAnalyzerName());
 	table[index] = std::move(analyzer);
 	}