Fix file dialog extension filtering

Author: mysteryx93

samples/Avalonia/Demo.FluentContentDialog/MainWindowViewModel.cs

@@ -3,7 +3,6 @@
 using FluentAvalonia.UI.Controls;
 using HanumanInstitute.MvvmDialogs;
 using HanumanInstitute.MvvmDialogs.Avalonia.Fluent;
-using HanumanInstitute.MvvmDialogs.FrameworkDialogs;
 using ReactiveUI;
 
 namespace Demo.Avalonia.FluentContentDialog;

samples/Avalonia/Demo.FluentTaskDialog/MainWindowViewModel.cs

@@ -4,7 +4,6 @@
 using FluentAvalonia.UI.Controls;
 using HanumanInstitute.MvvmDialogs;
 using HanumanInstitute.MvvmDialogs.Avalonia.Fluent;
-using HanumanInstitute.MvvmDialogs.FrameworkDialogs;
 using ReactiveUI;
 
 namespace Demo.Avalonia.FluentTaskDialog;

src/MvvmDialogs.Avalonia/DialogFactory.cs

@@ -105,7 +105,7 @@ private static List<FilePickerFileType> SyncFilters(List<FileFilter> filters) =>
         filters.Select(
             x => new FilePickerFileType(x.NameToString(x.ExtensionsToString()))
             {
-                Patterns = x.Extensions?.Select(y => y.TrimStart('.')).ToList(),
+                Patterns = x.Extensions?.Select(y => "*." + y.TrimStart('.')).ToList(),
                 MimeTypes = x.MimeTypes,
                 AppleUniformTypeIdentifiers = x.AppleUniformTypeIdentifiers
             }).ToList();