Refactor image deletion to use confirmation dialog helper

Simplified the DeleteImage method by replacing manual dialog
creation and result handling with DialogServiceHelper
.ShowConfirmationDialogAsync. This centralizes confirmation
logic and improves code readability and maintainability.

Author: neozhu

src/Server.UI/Pages/Products/Components/ProductFormDialog.razor

@@ -136,18 +136,14 @@
     {
         if (Model.Pictures != null)
         {
-            var parameters = new DialogParameters<ConfirmationDialog>
-            {
-                { x => x.ContentText, $"{L["Are you sure you want to erase this image?"]}" }
-            };
-            var options = new DialogOptions { CloseButton = true, MaxWidth = MaxWidth.ExtraSmall, FullWidth = true };
-            var dialog = await DialogService.ShowAsync<ConfirmationDialog>($"{L["Erase imatge"]}", parameters, options);
-            var state = await dialog.Result;
-
-            if (state is not null && !state.Canceled)
-            {
-                Model.Pictures.Remove(picture);
-            }
+			await DialogServiceHelper.ShowConfirmationDialogAsync(
+				$"{L["Erase imatge"]}",
+				$"{L["Are you sure you want to erase this image?"]}",
+				async () =>
+				{
+					Model.Pictures.Remove(picture);
+				});
+             
         }
     }