Fixing problems with RML parameters in TRestRawSignalChannelActivity

[cmargalejo]

Solving some of the problems that were discussed in PR #72

[jgalan]

Hi, the pipeline is failing because the veto observable vetoRaw_max_amplitude_map is not anymore between the observables inside the analysisTree.

In previous versions where it was working, it seems the dictionary was being generated on the fly.

Creating external dictionary for: "map<int,double>":
[105](https://gitlab.cern.ch/rest-for-physics/rawlib/-/jobs/22648438#L105)/builds/rest-for-physics/rawlib/install//.rest/AddonDict/Dict_map_int_double_.so

Now, when running the same processing, the observable will not be added:

In TRestReflector::TRestReflector() : unrecognized type: "map<int,double>"
Error adding observable "vetoRaw_max_amplitude_map" with type "map<int,double>", type not found!

It was the automatic generation disabled? Should we add it now manually? @nkx @juanangp @lobis