Linux: Fix file picker not launching from disabling core dumps

Core dumps are disabled by default on Linux, but this prevents access to the file picker due to security hardening. To work around this, core dumps are selectively enabled and disabled around the file picker tasks.

src/Ryujinx/UI/Views/User/UserProfileImageSelectorView.axaml.cs

@@ -8,6 +8,7 @@ using Ryujinx.Ava.Common.Locale;
 using Ryujinx.Ava.UI.Controls;
 using Ryujinx.Ava.UI.Models;
 using Ryujinx.Ava.UI.ViewModels;
+using Ryujinx.Common.Utilities;
 using Ryujinx.HLE.FileSystem;
 using SkiaSharp;
 using System.Collections.Generic;
@@ -62,6 +63,8 @@ namespace Ryujinx.Ava.UI.Views.User
 
         private async void Import_OnClick(object sender, RoutedEventArgs e)
         {
+            OsUtils.SetCoreDumpable(true);
+
             IReadOnlyList<IStorageFile> result = await ((Window)this.GetVisualRoot()!).StorageProvider.OpenFilePickerAsync(new FilePickerOpenOptions
             {
                 AllowMultiple = false,
@@ -81,6 +84,11 @@ namespace Ryujinx.Ava.UI.Views.User
                 _profile.Image = ProcessProfileImage(File.ReadAllBytes(result[0].Path.LocalPath));
                 _parent.GoBack();
             }
+
+            if (!Program.CoreDumpArg)
+            {
+                OsUtils.SetCoreDumpable(false);
+            }
         }
 
         private void GoBack(object sender, RoutedEventArgs e)