Fix weekly alarm schedule having inconsistent id

[AhsanSarwar45]

This caused it to display the following bugs when scheduled off:

• Settings were not getting saved
• Alarm couldn't be enabled
• Alarm couldn't be deleted
• Alarm couldn't be reordered

Fixes #54

[codecov-commenter]

Codecov Report

Attention: 121 lines in your changes are missing coverage. Please review.

Comparison is base (32b3af6) 31.44% compared to head (d4b9499) 31.34%.

Files	Patch %	Lines
lib/timer/types/timer.dart	0.00%	17 Missing ⚠️
lib/alarm/types/alarm.dart	0.00%	15 Missing ⚠️
lib/stopwatch/types/stopwatch.dart	0.00%	12 Missing ⚠️
...ib/alarm/types/schedules/dates_alarm_schedule.dart	0.00%	10 Missing ⚠️
lib/clock/types/city.dart	0.00%	9 Missing ⚠️
lib/stopwatch/types/lap.dart	0.00%	7 Missing ⚠️
...b/alarm/types/schedules/weekly_alarm_schedule.dart	75.00%	6 Missing ⚠️
lib/alarm/types/alarm_task.dart	0.00%	5 Missing ⚠️
lib/timer/types/timer_preset.dart	0.00%	5 Missing ⚠️
lib/alarm/logic/alarm_controls.dart	0.00%	4 Missing ⚠️
... and 11 more

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #59      +/-   ##
===========================================
- Coverage    31.44%   31.34%   -0.11%     
===========================================
  Files          212      212              
  Lines         7969     8015      +46     
===========================================
+ Hits          2506     2512       +6     
- Misses        5463     5503      +40     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.