b/326368633 Remove duplicate 'you' in dialog message (#1306)

sources/Google.Solutions.IapDesktop.Extensions.Management/ToolWindows/InstanceControlCommands.cs

@@ -166,7 +166,7 @@ public override async Task ExecuteAsync(IProjectModelNode context)
                 if (this.serviceProvider.GetService<IConfirmationDialog>()
                     .Confirm(
                         mainWindow,
-                        "Are you you sure you want to " +
+                        "Are you sure you want to " +
                             $"{this.controlCommand.ToString().ToLower()} {instance.Name}?",
                         $"{this.controlCommand} {instance.Name}?",
                         $"{this.controlCommand} VM instance") != DialogResult.Yes)