Confusing error message

[matthijsgeers-riscure]

https://github.com/Riscure/java-trsfile/blob/68eb0e80283f12981c5ad81a8d6f6107d9edd481/src/main/java/com/riscure/trs/parameter/trace/TraceParameterMap.java#L19

This message is the same as the one in TraceSetParameterMap.java, and doesn't distinguish between trace parameters and trace set parameters. They should be edited to be more specific, for example by making this one "Parameter %s was not found in the trace".