Revert "Fix in TRD sector getter"

[shahor02]

This reverts commit 7262c36. The correction of #14589 was actually not needed, just the name of the method is misleading.

At least the

AliceO2/Detectors/TRD/simulation/src/Detector.cxx

Lines 108 to 111 in cd8e576

	const int idChamber = mGeom->getDetectorSec(cIdChamber);
	if (idChamber < 0 || idChamber > 29) {
	LOG(fatal) << "Chamber ID out of bounds";
	}

uses this method to get detector ID within the sector rather than the sector ID.

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[shahor02]

Merging as the previous correction was wrong and may create problems.