Storage scenarios: parameter assignment is ambigous (two possible locations for assigning capacity)

[uschilt]

Capacity assignment in storage scenarios is now done in a new dict (see below). This is confusing, as it ignores the parameters in the tech dict (e.g., 'tes_decentralised'). Either create a separate scenario dict where all parameters are defined (incl. scenario activation), or use the parameters from the respective tech dicts. There should be no duplicates.

'thermal_energy_storage_scenario': {
    'capacity_kWh': 0,
    'initial_charge': 0.5,
},

'battery_energy_storage_scenario': {
    'capacity_kWh': 1e4,
    'initial_charge': 0.5,
},