(Actually)Fix wrong message time

Forgot to account for 0:XX am in previous commit

lib/utils/date_time_extension.dart

@@ -34,7 +34,7 @@ extension DateTimeExtension on DateTime {
   /// Returns a simple time String.
   /// TODO: Add localization
   String localizedTimeOfDay(BuildContext context) {
-    return L10n.of(context).timeOfDay(_z(hour == 12 ? hour : hour % 12),
+    return L10n.of(context).timeOfDay(_z(hour % 12 == 0 ? 12 : hour % 12),
         _z(hour), _z(minute), hour > 11 ? 'pm' : 'am');
   }