Enable deletion of time series

[FredericHirschmueller]

If I upload a timeseries for certain parameters like the COP for the heat pump, the energy price or the feedin tariff for the energy provider, etc. it would be nice, if I could delete the timeseries through a button. If i currently want to delete the timeseries, I have to click into the parameter input field, select every time step of the time series and than click on delete.