The CellGroup is created considering UID, for example:
'pucchres0->startingPRB = 8 + uid;' and since we keep the CellGroup from
the previous RNTI/UID we should keep also the previous UID.

Considering the scenario where a UE did successful RRCReestablishment,
it was getting uid = 1, and uid = 0 was removed.
When another UE connected, it was getting UID = 0 (because 0 was already
free), and so the PUCCH 0 resource was conflicting with the first UE.

On that occasion, also correct the comment that describes the code, as
it was wrong/misleading.