Define electron_with_fsrc by adjusting existing electron FSP
When comparing the cuts defined for the FSP electron_with_fsrc
with the cuts
from the electron
FSP defined in AnalysisTools, I saw that they are actually
the same. The same goes for all the other properties except the final state
radiation correction. That is why this PR reduced duplication by just copying
the other electron and adjusting the FSR-property.
One point against this PR would be to keep both repositories separate. Maybe in the future we will want to adjust the electron in the AnalysisTools repository without affecting the RDStar analysis or viceversa. So view this PR as a suggestion.