Fix a crash in scheduled event early notification (#83)

This PR fixes a fatal crash that occurs when the bot tries to send an
early notification for a scheduled event. An exception is thrown by
`string#Format` when the argument list provided doesn't match the
argument list in the template. This is fixed by correcting the template
and the argument list

Signed-off-by: Octol1ttle <l1ttleofficial@outlook.com>

src/Services/Update/ScheduledEventUpdateService.cs

@@ -359,7 +359,9 @@ public sealed class ScheduledEventUpdateService : BackgroundService
         }
 
         var earlyResult = new EmbedBuilder()
-            .WithSmallTitle(string.Format(Messages.EventEarlyNotification, scheduledEvent.Name), currentUser)
+            .WithSmallTitle(
+                string.Format(Messages.EventEarlyNotification, scheduledEvent.Name,
+                    Markdown.Timestamp(scheduledEvent.ScheduledStartTime, TimestampStyle.RelativeTime)), currentUser)
             .WithColour(ColorsList.Default)
             .WithCurrentTimestamp()
             .Build();