add "tdelt" to transmission losses of electricity

[robertpietzcker]

currently, only the losses via "tdels" are reported, while also the losses via tdelt should be added:

remind2/R/reportSE.R

Line 514 in 33eaffe

setNames(dimSums(vm_demSe[, , "tdels"] * (1 - pm_eta_conv[, , "tdels"]), dim = 3),