solve the date fix in a cleaner way

Author: Dieterbe

lib/models/body_weight/weight_entry.dart

@@ -43,7 +43,7 @@ class WeightEntry {
   WeightEntry copyWith({int? id, int? weight, DateTime? date}) => WeightEntry(
         id: id,
         weight: weight ?? this.weight,
-        date: date ?? DateTime.now(),
+        date: date ?? this.date,
       );
 
   // Boilerplate

lib/screens/weight_screen.dart

@@ -43,7 +43,7 @@ class WeightScreen extends StatelessWidget {
             FormScreen.routeName,
             arguments: FormScreenArguments(
               AppLocalizations.of(context).newEntry,
-              WeightForm(lastWeightEntry?.copyWith(id: null)),
+              WeightForm(lastWeightEntry?.copyWith(id: null, date: DateTime.now())),
             ),
           );
         },

lib/widgets/dashboard/widgets.dart

@@ -209,7 +209,9 @@ class _DashboardWeightWidgetState extends State<DashboardWeightWidget> {
                                 FormScreen.routeName,
                                 arguments: FormScreenArguments(
                                   AppLocalizations.of(context).newEntry,
-                                  WeightForm(weightProvider.getNewestEntry()?.copyWith(id: null)),
+                                  WeightForm(weightProvider
+                                      .getNewestEntry()
+                                      ?.copyWith(id: null, date: DateTime.now())),
                                 ),
                               );
                             },