Avoid leaking RenderEngine

... as this might allow an underlying `RenderEngineThreaded` thread
to race against the process shutdown.

Bug: b/361574971
Test: ATP cuttlefish_gfxstream_guest_angle_graphics_vts_tests
Change-Id: Ief71d8931ec3560780a850d8bb8bc727bbff5c52
diff --git a/graphics/composer/aidl/vts/RenderEngineVts.cpp b/graphics/composer/aidl/vts/RenderEngineVts.cpp
index 4e7f773..bc5eb6f 100644
--- a/graphics/composer/aidl/vts/RenderEngineVts.cpp
+++ b/graphics/composer/aidl/vts/RenderEngineVts.cpp
@@ -28,9 +28,7 @@
     mRenderEngine = ::android::renderengine::RenderEngine::create(args);
 }
 
-TestRenderEngine::~TestRenderEngine() {
-    mRenderEngine.release();
-}
+TestRenderEngine::~TestRenderEngine() {}
 
 void TestRenderEngine::setRenderLayers(std::vector<std::shared_ptr<TestLayer>> layers) {
     sort(layers.begin(), layers.end(),