Correct redeeming users count in RewardPointRedemptionEvents overview #3898

Job	Run time
Build wheel	1m 50s
Backup process	2m 58s
Formatting	1m 35s
Linter	1m 31s
MyPy	1m 40s
Build nix environment on MacOS	4m 40s
Test + Coverage	3m 7s
Test Frontend	3m 17s
Test (shuffled order)	2m 18s
Test if testdata is up to date	1m 57s
Test Typescript	1m 47s
Install wheel with system Python	11s
	26m 51s

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