Entities/MemberHistory: Add CompanyHasSigned

Elwig/ViewModels/MemberBusinessSharesViewModel.cs

@@ -52,6 +52,8 @@ namespace Elwig.ViewModels {
         [ObservableProperty]
         private bool _deduct;
         [ObservableProperty]
+        private bool _companyHasSigned;
+        [ObservableProperty]
         private bool _memberHasSigned;
         [ObservableProperty]
         private string? _valuePerShareString;