Werk #12661: BI aggregation datasource program: Fixed "By aggregation name" filter

Component	BI
Title	BI aggregation datasource program: Fixed "By aggregation name" filter
Date	Jul 19, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p9 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

This filter did not work at all. Also updated the documentation that this filter only supports exact aggregation name matches

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