L1CaloFEXByteStream: Fix cppcheck warnings.

Declare crc methods to operate on unsigned quantities. Fixes warnings about undefined shifts of signed integers.

This merge request affects 1 package:

• Trigger/TrigT1/L1CaloFEX/L1CaloFEXByteStream

This merge request affects 2 files:

• Trigger/TrigT1/L1CaloFEX/L1CaloFEXByteStream/src/gFexInputByteStreamTool.cxx
• Trigger/TrigT1/L1CaloFEX/L1CaloFEXByteStream/src/gFexInputByteStreamTool.h

Adding @thompson ,@will as watchers

added L1Calo Trigger main review-pending-level-1 labels

CI Result SUCCESS (hash e1e1ae26)

	Athena
externals
cmake
make
tests

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Athena: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 2885]

removed review-pending-level-1 label

added review-approved label

merged

mentioned in commit 8c889bbd