Make sure $completed is defined

Signed-off-by: Suki <suki@missallsunday.com>
same for ManageTasks::ScheduledTasks() :(

Signed-off-by: Suki <suki@missallsunday.com>
The "Run now" and "Save Changes" weren't aligned with theor respective columns so change the columns.

Signed-off-by: Suki <suki@missallsunday.com>