RpcDigitizationTool.ClusterSize1_2uncorr should be created consistently as a bool

Previously the RpcDigitizationTool.ClusterSize1_2uncorr variable was configured and used as an int (0 or 1) despite being declared as a bool. This should have no effect on the output, but was producing spurious diffs in configuration comparisons.

Tagging @jojungge.