PointerController: Simplify display info listener registration

Bug: 313033164
Test: Presubmit
Change-Id: I71e4943d36e0e3b5b0c9eaaaef7c8d04a82ba90d
diff --git a/libs/input/tests/PointerController_test.cpp b/libs/input/tests/PointerController_test.cpp
index 45b426b..a1bb5b3 100644
--- a/libs/input/tests/PointerController_test.cpp
+++ b/libs/input/tests/PointerController_test.cpp
@@ -161,8 +161,7 @@
                     policy, looper, spriteController,
                     /*enabled=*/true,
                     [&registeredListener](const sp<android::gui::WindowInfosListener>& listener)
-                            -> std::pair<std::vector<gui::WindowInfo>,
-                                         std::vector<gui::DisplayInfo>> {
+                            -> std::vector<gui::DisplayInfo> {
                         // Register listener
                         registeredListener = listener;
                         return {};