Format multiline description

khal list --format "{start-time} - {end-time} :: [{title}] {description}
gives for multiline description

08:45 - 10:20 :: [My title] Description line 1
Description line2
09:45 - 11:20 :: [My title2] Description line 1
Description line2

I.e. Second line of description is justified to the start time
Where I think the formatting should be:

08:45 - 10:20 :: [My title] Description line 1
                            Description line2
09:45 - 11:20 :: [My title2] Description line 1
                             Description line2

I.e. the multiline description should be "internally justified"

Start by reproducing the output with the khal list --format command shown in the issue, then trace the CLI formatting entry point that renders multiline descriptions. Done means continuation lines are indented beneath the description text rather than aligned with the event start time, while subsequent events retain their existing alignment.