Remove check for input_stats_aggregated in RHIST reformatting

[bikegeek]

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Describe the Problem

The METcalcpy agg_stat.py does not have support for the histogram linetypes, therefore the check for whether the input stats have been aggregated via stat analysis (input_stats_aggregated setting) is unneccessary. Currently, if this is set to False, then a warning indicating that this is not implemented is generated.

Expected Behavior

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Environment

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