tauRec: fix flag check

Hello,

There was a recent jump in CPU for the first tau algorithm we run, while there was no change in any tool: https://atlaspmb.web.cern.ch/atlaspmb/arch-mon-fullchain_mc16_ttbar_valid_13tev_25ns_mu40/?test=cpu/master__x86_64-centos7-gcc8-opt#RAWtoESD/tau

It's due to !37904 (diffs) where rec.doESD should rather be rec.doESD(). As the check fails, we are not using the cached track-calo extrapolation, which causes the CPU increase.

I've rerun the data18 RAWtoALL SPOT test.

18:36:08 PMonSD          n    cpu    max@evt    vmem    max@evt  malloc    max@evt  component                                                                                                             
18:36:57 PMonSD [evt]   99    336    840@17       45   1472@1      2713   3928@41   TauCoreBuilderAlg

is, with the fix, back to

18:36:08 PMonSD [evt]   99    124    260@17       45   1472@1      2713   3928@41   TauCoreBuilderAlg

Cheers, Bertrand