Run DynVarFixerAlg on egammaClustersAux.

Jovan Mitrevskirequested to merge
jmitrevs/athena:21.2_egammaClusterELFix into 21.2

This fixes the links to constituent clusters in egammaClusters, as discussed in ATLASG-1460. It fixes the symptoms, though the reason this is needed is not clear.

Tagging @christos and @akraszna.

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