init: use rvalues references for callees of ParseLineSection()

ParseLineSection() provides 'args' as an rvalue reference, so its
callers can and should use it as such.  This saves some copying
overhead and cleans up the code a bit.

Test: boot
Change-Id: Ib906318583dc81de9ea585f5f09fdff35403be1b
diff --git a/init/action_manager.cpp b/init/action_manager.cpp
index 22977bb..9de4085 100644
--- a/init/action_manager.cpp
+++ b/init/action_manager.cpp
@@ -47,9 +47,7 @@
 void ActionManager::QueueBuiltinAction(BuiltinFunction func, const std::string& name) {
     auto action = std::make_unique<Action>(true, nullptr, "<Builtin Action>", 0, name,
                                            std::map<std::string, std::string>{});
-    std::vector<std::string> name_vector{name};
-
-    action->AddCommand(func, name_vector, 0);
+    action->AddCommand(func, {name}, 0);
 
     event_queue_.emplace(action.get());
     actions_.emplace_back(std::move(action));