refactor: remove ConfigureAwait when we need to go back to UIThread after it

Signed-off-by: leo <longshuang@msn.cn>

src/ViewModels/AddSubmodule.cs

@@ -61,8 +61,7 @@ namespace SourceGit.ViewModels
 
             var succ = await new Commands.Submodule(_repo.FullPath)
                 .Use(log)
-                .AddAsync(_url, relativePath, Recursive)
-                .ConfigureAwait(false);
+                .AddAsync(_url, relativePath, Recursive);
 
             log.Complete();
             _repo.SetWatcherEnabled(true);