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Fix for Monitoring of Pixel FE errors

Iskander Ibragimov requested to merge ibragimo/athena:pixel-fe-error-bugfix into 21.0

The error information stored per Pixel FE, which is used in the pixel monitoring is not always correct.

The issue is that if there are multiple FE's with FE/MCC errors in the same pixel module (there are 16 FEs and one MCC chip in a pixel module), then the error word of the last FE with FE/MCC error will also get the error bits of the previous FE's with error (if there are any) being set.

Another issue with the double-counting errors has been fixed in the monitoring code itself.

Both changes are related only to the monitoring to correctly display the errors. Re-opening MR since the code is still being used for validation of the release 22.0.

Edited by Iskander Ibragimov

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