Remove extra padding from workouts rest timers

Typically rest timers don't have double digit minutes.
This doesn't prevent that, but will save space 99% of the time,
and in the odd situation where a rest duration is >9 minutes
will be slightly uneven.

WorkoutItem.tsx

@@ -36,9 +36,8 @@ export default function WorkoutItem({
   );
 
   const description = useMemo(() => {
-    const minutes = item.minutes?.toString().padStart(2, '0');
     const seconds = item.seconds?.toString().padStart(2, '0');
-    if (settings.alarm) return `${item.sets} x ${minutes}:${seconds}`;
+    if (settings.alarm) return `${item.sets} x ${item.minutes || 0}:${seconds}`;
     return `${item.sets}`;
   }, [item, settings.alarm]);