tidy: Fix "readability-redundant-smartptr-get" warning in videolist.cpp.

Remove the redundant call.

https://clang.llvm.org/extra/clang-tidy/checks/readability-redundant-smartptr-get.html

mythtv/programs/mythfrontend/videolist.cpp

@@ -1074,7 +1074,7 @@ static void copy_filtered_tree(meta_dir_node &dst, meta_dir_node &src,
                                            node->GetHost(),
                                            node->GetPrefix(),
                                            node->GetData());
-        copy_filtered_tree(*sdn, *(dir->get()), filter);
+        copy_filtered_tree(*sdn, **dir, filter);
     }
 }