clients/shell/src/chat: Add new arg to NewMountTableDispatcher

See: https://vanadium-review.googlesource.com/#/c/9878

MultiPart: 3/3
Change-Id: Ib20b5c511fe7607200833a86d174ba1c3f30a24a
diff --git a/clients/shell/src/chat/channel_test.go b/clients/shell/src/chat/channel_test.go
index 6873eb2..3eb7e1d 100644
--- a/clients/shell/src/chat/channel_test.go
+++ b/clients/shell/src/chat/channel_test.go
@@ -31,7 +31,7 @@
 	if err != nil {
 		return fmt.Errorf("root failed: %v", err)
 	}
-	mt, err := mounttablelib.NewMountTableDispatcher("")
+	mt, err := mounttablelib.NewMountTableDispatcher("", "mounttable")
 	if err != nil {
 		return fmt.Errorf("mounttable.NewMountTableDispatcher failed: %s", err)
 	}